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 kgvertically 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)

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Answers

2015-10-05T16:08:38+05:30
The cars are made with bumpers that can be pushed n during crash so that the crashing forces an be minimized. bumpers works on basis of second law of motion given by Newton. it states that if time is increased the force is decr asked. now bumpers increases the time and hence force is decreased. and prevents from much damage!
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