A 78.0 kg person falls straight down from a 1.60 m height (measured from his feet) and lands with weight distributed equally on both feet. To soften the blow, he bends his knees so that it takes 0.750s for him to stop once his feet touch the ground. (a) What average force does the floor exert on each foot while he is stopping?(b) Suppose instead that he lands stiff-legged and stops in only 0.100s. What force does the floor now exert on each foot?

Q: As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air…

A: the work done is equal to the kinetic energy gained by the ball,

Q: As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air…

A:

Q: Calculate the average force a bumper would have to exert to bring a 1000-kg car torest in 20 cm when…

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A: Let F denotes the average force, d denotes the distance over the force is applied, and W denotes the…

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A: According to Newton’s third law, the force exerted by water on diver is equal to the force exerted…

Q: A high diver of mass 69.8 kg steps off a board 10.0 m above the water and falls vertical to the…

A: Use the kinematic equation to solve for the velocity of the diver when she touches the water.

Q: A high jumper with a body weight of 820 N exerts an average vertical force of 1640 N down on the…

A: Given  Force applied by jumper on floor F=1640 N  Time t=0.75s Weight w=820N

Q: A gun is shot into a 0.50 kN block which is hanging from a rope of 1.8 m long. The weight of the…

A:

Q: What average force is required to push a 20-kg stroller with your toddler in it for 5 seconds if the…

A:

Q: Two blocks, A (mass=5.00 kg) and B (mass= 10.0 kg) are suspended by a cord on either side of a…

A: Two blocks, A (mass=5.00 kg)and B (mass= 10.0 kg) are suspended by a cord on either side of a…

Q: As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air…

A: Let the initial velocity be zero, final velocity be 21.5m/s.Consider the kinematic equation for…

Q: In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and…

A: Given:  initial velocity, u = 0 m/s  final velocity, v = 45 m/s  time, t = 7 s  mass, m = 5.5 x 103…

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A:

Q: A 10 g bullet leaves the 0.75 m barrel of a gun with 250 m/s speed. The force exerted on the bullet…

A:

Q: As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air…

A: Step 1It is given that

Q: How much force is required to bring a car of mass 1352 kg, initially traveling at 15.1 m/s, to rest…

A:

Q: How much force is required to bring a car of mass 1451 kg, initially traveling at 16.7 m/s, to rest…

A: Given  Mass of car  m = 1451 kg  Initial speed of car u = 16.7 m/s  Final speed of car  v = 0 m/s…

Q: A vehicle with a mass of (3482.44)kg is being tested for its engine consumption by measuring the…

A: Consider the figure describing the given situation.     Here, F represents the force needed to move…

Q: a 60 kg object is moving at 20m/s when a force brings the object to rest in 0.050 seconds. of the…

A: Given, mass of the object (m) = 60 kg  Initial speed (u) = 20 m/s  Final speed (v) = 0 m/s  Time…

Q: A 10 kg block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and…

A: Given information,mass of block, m=10kginitial velocity  , u=10m/sdistance , s= 10mtime ,  t=2sso…

Q: A bullet of mass 20g traveling at 16m/s penetrates a sand bag and is brought to rest in 0.05s . Find…

A: A. Depth of penetration  is  0.4m B. Average  retarding  force is 6.4

Q: A 120-kg car starts at rest and accelerates forward, reaching a velocity of 1600 cm/s in 5 s. What…

A:

Q: A stone has a weight of 40 N on the Mars, where g = 3.7 m/s?. The mass of the stone is a. 4.08 kg O…

A:

Q: A 69.8 kg bungee jumper is initially standing at rest on a bridge. After falling a distance 13.2 m,…

A: Given, a mass m = 69.8 kg bungee jumper is initially standing at rest on a bridge (taking downward…

Q: The 215-kg lunar lander is descending onto the moon's surface with a velocity of 4.5 m/s when its…

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Q: On a head-on vehicular collision where both drivers are not wearing seatbelt and have no available…

A:

Q: A 4.54 × 104-kg lunar landing craft is about to touch down on the surface of the moon, where the…

A: Given: Firstly we find the acceleration of spacecraft by using the third kinematic equation.…

Q: The IKAROS spacecraft, launched in 2010, was designed to test the feasibility of solar sails for…

A: Given that, Mass of the spacecraft, m=290 kg Force, F=1.12mN=1.12×10-3N Duration, t=6 months=6×30…

Q: As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air…

A:

Q: As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air…

A:

Q: If a net horizontal push of 132 N is applied to a person applied  with mass 60 Kg who is resting on…

A: Given The net horizontal force applied to a person is F=132 N. The mass of a person is m=60 kg.…

Q: A 1000 kg car was travelling at 45m/s when it hit a concrete wall due to drunk driving. Find the…

A: mass of car (m) = 1000 kg Initial velocity (u) = 45 msfinal velocity (v) = 0 mstime (t) = 0.5 sec

Q: A 480-gram ball is traveling horizontally at 11.9 m/s to the left when it is suddenly struck…

A: According to the Newton's second law, the rate of change of momentum is equal to the force.  F→ =…

Q: A 3 kg particle starts from rest and moves a distance of 4 m in 2 sec under the action of a single…

A: If a mass ‘m’ has acceleration ‘a’ then from Newton's 2nd law of motion, the force on the body is…

Q: A gun is shot into a 0.50 KN block which is hanging from a rope of 1.8m long. The weight of the…

A:

Q: As a protest against the umpire's calls, a baseball pitcher throws a ball straight up into the air…

A: According to the given condition, the initial speed (u) is zero and the final speed (v) is 22 m/s.…

Q: A lump of clay of mass 0.31 kg is dropped from a height of 8.1 m. The clay comes to a full stop…

A:

Q: A high diver of mass 64.3 kg steps off a board 10.0 m above the water and falls vertical to the…

A: the velocity and acceleration is,

Q: A riot police officer wields a large 4.00 -[kg] shield that is initially at rest. A protester rushes…

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Q: In the figure below, a runaway truck with failed brakes is moving downgrade at 36 m/s just before…

A: By law of conservation of energy  KE bottom= PE top

Q: A 76.1 kg astronaut of holding a 12.3 kg tool pack while drifting at 10.6 m/s to the right. She…

A:

Q: A bowling ball weighing 70.0 N initially moves at a speed of 5.00 m/s. How long must a force of 45.0…

A:

Q: In a slap shot in hockey, the stick and puck are only in contact for 0.030s. During this time, the…

A:

Q: Squids are the fastest marine invertebrates, using a powerful set of muscles to take in and then…

A: Apply the momentum conservation equation. Here, ms represents the mass of squid, mw represents the…

Q: A 12582 kg aeroplane is about to take off and the pilot increases the engine's thrust from 26 kN to…

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Q: A trailer truck enters a 2 percent uphill grade traveling at 66 km/h and reaches a speed of 108 km/h…

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Q: A bicyclist and his bicycle have a mass of 105 kg. What forces is necessary to bring him to rest…

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Q: A lump of clay of mass 0.28 kg is dropped from a height of 10.8 m. The clay comes to a full stop…

A: mass of lump of clay (m) = 0.28 kg initial height (h) = 10.8 mInitial velocity (u) = 0 ms

Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: