A 100-kg man is ina car travelling at 20m/s.(a) Find his kinetic energy.(b)The car strikes a concrete wall and comes to rest after the front of car has collapsed 1m.The man is wearing a seat belt and harness.what is the average force exerted by the belt and harness during crash?
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Explanation:
Given = 100 kg man
velocity = 20m/s
A) K.E = 1/2 X Mass X
= 1/2 X 100Kg X 400m/
= 20000Kg m/
B) Force = Mass X Accelaration
= 100 Kg X 400m/
= 40000 Newtons
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