Question

1. A ball of mass M = 2 Kg is released at rest(V₀=0) from the top of a building at a height H=d= 125 m above the ground. There is no air resistance. Take g=10m/s². The ball's final kinetic energy just before it hits the ground is ___ Joules

25,000
20
2,500
250

2. A car of mass M=1000 Kg moving initially at V_o= 30 m/s stops (Vf=0)after hitting a cement wall. The car spends a time  t=0.015 seconds from the moment it hits the cement wall until it finally stops.. The magnitude of the force exerted by the cement wall on the car during this time is ___ N

Part A

200, 000

2, 000, 000

30, 000

300, 000

Part B

The same car having mass M=1000 Kg and travelling at the same initial velocity V₀=30m/s hits a hay stack and stops (V_f=0). The car spends time t= 150 seconds from the moment it hits the hay stack and stop finally. The magnitude of the force exerted by the hay stack on the car is ______ N

The same car having mass M=1000 Kg and travelling at the same initial velocity V₀=30m/s hits a hay stack and stops (V_f=0). The car spends time t= 150 seconds from the moment it hits the hay stack and stop finally. The magnitude of the force exerted by the hay stack on the car is ______ N

200

2000

200,000

20000

Part C

The change in car's momentum after hitting the cement wall and stopping is ___the change in car's momentum after hitting the hay stack and stopping.

The change in car's momentum after hitting the cement wall and stopping is ___the change in car's momentum after hitting the hay stack and stopping.

equal to

more than

less than

Part D

The impulse exerted by the cement wall to stop the car is _____ the impulse exerted by the hay stack to stop the car.

The impulse exerted by the cement wall to stop the car is _____ the impulse exerted by the hay stack to stop the car.

more than

equal to

less than

Answer 1

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