Momentum Review Questions

# The 50kg block has a perfectly inelastic collision

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The 50kg block has a perfectly inelastic collision with the 20kg block. If the coefficient of kinetic friction between the blocks and the horizontal surface is 0.2, how far will they skid before coming to a stop? 9.56m 3) A bullet traveling horizontally at 300m/s hits a 1.2kg wooden block which is initially at rest. The block is sitting on a horizontal surface and the coefficient of kinetic friction between the block and the surface is 0.3. The bullet goes through the wooden block and comes out the other side at 200m/s. After the bullet travels through the block, the block moves 0.lm before skidding to a stop. What is the mass of the bullet? 0.0092kg 4) A 1,200kg car is moving at 40m/s when the driver notices a cliff 100m ahead. The driver takes 0.4s to react and hit the brakes. The car skids with a coefficient of kinetic friction of 0.32 but unfortunately does not stop in time. Luckily there is 500kg concrete barrier to stop the car. The car crashes inelastically into the barrier and bounces back at 1.5m/s. If the cliff is 30m high, where will the concrete barrier land? 203.03m
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