A) Why are cars made with bumpers that can be pushed in during a crash? (5)
b) A crane operated by an electric motor has a mass of 500 kg. It raises a load of 300 kg
vertically at a steady speed of 0.2 ms−1
. Assume resistance to be constant at 1200 N.
What is the power required to raise the load? (5)



I know the answer to part a).
the reason is because if there is an accident,the bumper will absorb much of the shock and there will not be much affect on the passengers