A 51.9-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -2.25 m/s. Her hands are in contact with the wall for 0.999 s. Ignore friction and wind resistance. Find the average force she exerts on the wall

Q: A rock of mass m = 1.9 kg is released from a height of h = 3.2 m into a basin of water. At a time of…

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Q: What average force is necessary to stop a 16 g bullet travelling at 260 m/s as it penetrates into a…

A: Using kinematic equation, the expression for find acceleration of the bullet is v2=u2+2asa=v2-u22s…

Q: A block of mass m1 = 10.5 kg slides along a horizontal surface (with friction, μk = 0.29) a distance…

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Q: In a crash test, a car with a mass of 1200 kg hits the wall as shown. the car's initial and final…

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Q: As part of a safety investigation, two 1400 kg cars traveling at 20 m/s are crashed into different…

A: Given mass of car m=1400 kgspeed of car u=20 msCars are crashed into different barriers .

Q: A block of mass m1 = 10.5 kg slides along a horizontal surface (with friction, μk = 0.24) a distance…

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Q: An amateur golfer swings a golf club, striking a golf ball that has a mass of 55.0 g. The club is in…

A: Write the expression for the magnitude of the average force on the ball

Q: A golf ball of mass 0.045 kg is hit off the tee at a speed of 45 m/s. The golf club was in contact…

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Q: An office worker smacks a table, bringing his hand to rest in 0.0025 seconds from an initial speed…

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Q: LA 3 kg steel ballI falls down vertically and strikes a floor with a speed of 12 m/s. It bounces off…

A: Given data:  Mass (m) = 3 kg Initial velocity (Vi) = -12 m/s Final velocity (Vf) = +12 m/s Time…

Q: A stone of mass m = 1.55 kg is dropped from a height of h = 3.9 m into a pool of water. At a time of…

A: Mass of stone (m) = 1.55 kg Initial height (h) = 3.9 m t = 1.9 s

Q: Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg…

A: Given data:  Initially two ice skaters are at rest Mass of first skater (m1) = 45 kg Speed of first…

Q: A 0.38 kg volley ball is traveling at 34 m/s when its hit back over the net by an opposing player…

A: We need to apply the concept of Conservation of energy . The acceleration generated due to the…

Q: A baseball (m = 152 g) approaches a bat horizontally at a speed of 43.6 m/s (97.6 mi/h) and is hit…

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Q: A tall man walking at 1.10 m/s accidentally bumps his head of mass 3.07 kg on a steel doorjamb. His…

A: Initial speed (u) = 1.1 m /s mass of steel doorjamb = 3.07 kg t = 0.019sec Final velocity (V) = 0…

Q: A 1.2 kg object moving with a speed of 8.0 m/s collides with a wall and rebounds with a speed of 6.0…

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Q: A block of mass m1 = 11.5 kg slides along a horizontal surface (with friction, μk = 0.21) a distance…

A: Apply work-energy theorem on block 1, and determine the velocity of block 1 just before striking a…

Q: baseball (m = 149 g) approaches a bat horizontally at a speed of 40.3 m/s (90 mi/h) and is hit…

A: Given data: mass of the ball m = 0.149 kg initial speed u = 40.3 m /s    Final speed v = -50.0  m/s…

Q: reviews the approach that is necessary for solving problems such as this one. A baseball (m = 148 g)…

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Q: A professional golfer swings a golf club, striking a golf ball that has a mass of 55.0 g. The club…

A: According to Newton’s 2nd law, force is the rate of change in momentum.

Q: రికంగ్ డ్ A hockey puck with mass 0.150 kg is sitting at rest on frictionless ice when it is struck…

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Q: A batter hits a 0.334 kg basball that was approaching him at 23.4 m/s and, as a result, the ball…

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Q: During a collision with a wall, the velocity of a 0.200-kg ball changes from 20.0 m/s toward the…

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Q: A machine gun, of mass 35.0 kg, fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the…

A: Given: The mass of the bullet is 50.0 g. The number of bullets per minute is 300. The muzzle…

Q: Realizing that he could not drive up a 35.0°, ice-covered hill because there was no friction, Rick…

A: SOlution: Given that m1 = 4x102 kg m2 = 2x103 kg v2 = 20 m/s

Q: Auto companies frequently tests the safety of the automobiles by putting them through crash tests to…

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Q: A tennis ball is flying east towards the wall with a speed of 41.3 m/s. After bounced against the…

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Q: A block of mass m1 = 14.5 kg slides along a horizontal surface (with friction, μk = 0.37) a distance…

A: Given that:- Mass of first block=m1=14.5kg

Q: 3. A 4.80 kg fish is swimming at 1.00 m/s to the right. He swallows a 1.50 kg fish swimming toward…

A: From conservation of energy, the initial momentum is equal to the final momentum.

Q: 56. mmh A baseball (m = 149 g) approaches a bat horizontally at a speed of 40.2 m/s (90 mi/h) and is…

A: Given:- mass of baseball=149g speed of baseball-40.2m/s time=1.10ms

Q: Two persons A and B who are at rest on an ice skating rink, push each other so that A acquires a…

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Q: A 1,400 kg car traveling at 31 m/s has a head-on collision with a 55,000 kg tank traveling at 5.0…

A: Given: The mass (m1) of the car is 1400 kg. The speed (v1) of the car is 31 m/s. The mass (m2) of…

Q: A football player kicks a 0.41-kg football initially at rest; and the ball flies through the air. If…

A: ball's speed after it is hit=> v=  21 m/s initially the ball was at rest, therefore u=0 m/s…

Q: A 0.00250 kg bullet travelling at 220.0 m/s strikes a 1.50 kg block of wood, which slides backwards.…

A: The initial kinetic energy of the bullet is, KE = 12mv2 = 12×0.0025×220×220 = 60.5J Now, by energy…

Q: A 22-g puck hits the wall of an air hockey table perpendicular to the wall with an initial speed of…

A: Given: The mass of the puck is 22 g. The striking velocity is 14 m/s. The rebounding velocity is 14…

Q: A soccer goalkeeper accelerates a ball from rest at a speed of 15 m / s for the time that his foot…

A: Force on an object equals to change in momentum of object w.r.t. time.

Q: A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground,…

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Q: A loaded tractor-trailer with a total mass of 5500 kg traveling at 2.5 km/h hits a loading dock and…

A: Conservation of momentum: It states that “the total momentum of a system remains conserved or…

Q: A minicab, of mass 3,000 kg collides with a 4,000 kg car at rest. The two vehicles coupled together…

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Q: A bullet of mass 2 kg is headed at horizontal speed 60 m/s toward a block of mass 14(2 kg) = 28 kg…

A: Given data: The mass of the bullet is m1=2 kg. The speed of the bullet is v0=60 m/s. The mass of…

Q: A block of mass m1 = 14 kg slides along a horizontal surface (with friction, μk = 0.27) a distance d…

A:

Q: Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg…

A: We have to apply law of conservation of momentum concept here.

Q: A varsity player of a volleyball team hit a 400 gram ball with a horizontal velocity of 5 m/s over…

A: Given value--- mass= 400 g. initial velocity = 5 m/s . final velocity = 6 m/s . time period = 0.002…

Q: Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg…

A:

Q: A 75.0 kg fullback running east with a speed of 4.00 m/s is tackled by a 91.0 kg opponent running…

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Q: Two ice skaters push off against one another starting from a stationary position. The 45.0-kg skater…

A: Given Mass of each skater is m1=45.0 kg and m2=60.0 kg

Q: A reckless coyote engineer straps on a pair of ice skates and attaches a rocket capable of producing…

A: The motion mentioned here is with constant force acting on the object which shows motion with…

Q: An open train car, with a mass of 2050 kg, coasts along a horizontal track at the speed 2.792.79…

A: If the net external forces acting on the system add up to zero, then the linear momentum of system…

Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”