A 75 kg student leaps from a burning hotel window to be caught by a fire net. His speed as he reaches the net is 20 m/s, and he is stopped by the net after sinking 1.15 m into it. Calculate the force of the net on the man

Q: 40. GO The drawing shows two boxes resting on frictionless ramps. One box is relatively light and…

A: (a)   Consider the lighter box, neglect the friction, use the energy conservation, and solve for its…

Q: If a projectile with a mass of 8.90 g is traveling at a speed of 1.11 km/s, determine the following.…

A: Given data *Mass of the projectile is m = 8.90 g  *Speed of the projectile is v = 1.11 km/s

Q: A ball of mass m = 1kg hits the floor with Initlal speed v = 2m/s, and vertically bounces back. The…

A: Given data: Mass of ball is, m=1 kg. Initial speed is, u=2 m/s.

Q: A boy of mass 40.0 kg is sledding down a 70.0-m slope starting from rest. The slope is angled at…

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Q: A golfer hits a 45 grams golf ball from the fairway with initial velocity 36m/s it lands on the…

A: The work done by all the forces is equal to the change in the energy of the system. Kinetic energy =…

Q: A stationary soccer ball of mass m = 0.76 kg is kicked with a constant force of F = 11 N. The…

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Q: A 3.8 kg wooden block initially at rest is struck by a 8 g bullet that enters at 654 m/s and 34° and…

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Q: 04a. A 5.67 kg watermelon is dropped from a height of 20.6 m. What will be the watermelon's speed…

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Q: In a railroad yard a 35,000 kg boxcar moving at 6.6 m/s is stopped by a spring-loaded bumper mounted…

A: When the car stops completely then all of its kinetic energy is stored as potential energy in the…

Q: A 60.0 kg skier with an initial speed of 15 m/s coasts up a 2.50 m high rise as shown in the figure.…

A: Given data- Mass of skier =60 kg Initial speed vi=15 m/s Height h=2.50 m Coefficient of kinetic…

Q: How long does it take a 2500 kg car to come to a stop from 15 m/s if it strikes a wall with a force…

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Q: a 600 gram banana sliding north on a frictionless table at 2.5 meters per second bounces of a 400…

A: Mass of banana =600gm Initial speed of banana = 2.5m/s Mass of kiwi = 400gm Initial speed of kiwi =0…

Q: a)Gayle runs at a speed of 3.80 m/s and dives on a sled, initially at rest on the top of a…

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Q: A 146-g baseball is dropped from a tree 15.0 m above the ground. With what speed would it hit the…

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Q: Calculate the final speed (in m/s) of a 111 kg rugby player who is initially running at 7.75 m/s but…

A: Given: mass of the player m = 111kg                       initial speed u = 7.75m/s…

Q: A 1000-kg car is moving at 40.0 km/hr when the driver slams on the brakes and skids to a stop (with…

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Q: A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7.0 m/s.…

A: The expression for the friction force,

Q: A 3,800-kg truck runs into the rear of a 1,000-kg car that was stationary. The truck and car are…

A: The momentum of an object p is defined as the product of it's mass m and velocity v , that is ,…

Q: During the pitching motion, a baseball pitcher exerted an average horizontal force of 60 N against…

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Q: are in a contact for only 1.80 s. Calculate the average force that the club has exerted on the ball.

A: Force = rate of change of momentum

Q: 19.5 m B The height of the drop from point A to point B is h = 19.5 m, the velocity of the car and…

A: Using conservation of energy: mgh = 12mv2-u2  9.8 x 19.5 = 0.5 x(v2-6.252) v= 20.525 m/s

Q: A cannon is fired from a hill 133 m high at an angle of 24.8° with respect to the horizontal. If the…

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Q: Determine the kinetic energy of a 1200 kg automobile travelling at 20 km/hr. How many times as great…

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Q: A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6.6 m/s.…

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Q: a 4.5 kg dog stands on an 18 kg flatboat at distance D=6.1 m from the shore. It walks 2.4 m along…

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Q: In a collision, a 1200 kg car initially moving at 30 m/s comes to a stop in 0.5 second. The…

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Q: A 1500 kgkg car skids to a halt on a wet road where μk = 0.49. How fast was the car traveling if it…

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Q: A 15-g bullet is shot vertically into an 2-kg block. The block lifts upward 8.0 mm (see the figure).…

A: Mass of bullet  (Mbullet) =  15x10-3 kg  Mass of block  (Mblock) =  2 kg  height (h) = 8x10-3 m

Q: Calculate the final speed (in m/s) of a 106 kg rugby player who is initially running at 7.50 m/s but…

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Q: (a) What is their final velocity in meters per second assuming negligible friction and that the 50.0…

A: The above problem can be solved by using the concept of law of conservation of momentum and energy

Q: A 21 g red superball traveling 23 m/s EAST has an elastic collision with a 81 g blue superball…

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Q: A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 7.8 m/s.…

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Q: A lumberjack is standing on a log floating on a lake. She starts from rest, then runs along the log…

A: Given that mass of the both logs and mass of the  lumberjack and speed of the lumberjack relative to…

Q: (A) (B) 5.00 m 3.20 m 2.00 m

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Q: a 1.75-kg block at rest on a ramp of height h.When the block is released, it slides without friction…

A: From conservation of energy, the required expression for the height is,

Q: Ignoring the resistances including air what will be the speed of the projectile when it touches the…

A: Given Mass of projectile = 12 g Initial speed of projectile = 1500 m/s We have to find the speed of…

Q: A 30-N stone is dropped from a height of 10 m and strikes the ground with a speed of 13 m/s. What…

A: It is given that,

Q: 60 kg | 10m 80kg A section of a roller coaster track assumed to be frictionless is shown with two…

A: a) Apply principle of conservation of mechanical energy, so the potential energy of the car gets…

Q: Two iceboats (one of mass m, one of mass 2m) hold a race on a frictionless, horizontal, frozen lake.…

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Q: A ball of mass m= 1kg hits the floor with initial speed v = 2m/s, and vertically bounces back. The…

A: Given: Mass of ball=1kg the initial speed of ball v=2m/s Force exerted by the ball on the floor is…

Q: a baseball catcher puts on an exhibition by catching a 0.15 kg ball, dropped from a helicopter at a…

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Q: Gayle runs at a speed of 3.95 m/s and dives on a sled, initially at rest on the top of a…

A: Given that:- Mass of Gayle=47kg  Mass of sled=5.4kg Mass of Gayle's brother=30kg Initial speed of…

Q: 600 gram banana sliding north on a frictionless table at 2.5 meters per second bounces of a 400 gram…

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Q: A 86.0 kg diver steps off a 10.0 m high diving board and drops, from rest, straight down into the…

A: Given   Mass of the driver m=86.0 kg  Height of diving board h=10.0 m  He comes to rest 7.20 m…

Q: A 1.2-kg rubber ball of speed of 8.0 m/s hits a floor and bounds back at speed of 6.0 m/s. Suppose…

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.