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A 100-kg man is in car traveling at 20 m s -1 (a) Find his kinetic energy. (b) The ear strikes a concrete wall

A 100-kg man is in à car traveling at 20 m s^-1

(a) Find his kinetic energy.

(b) The ear strikes a concrete wall and comes to rest after the front of the car has collapsed 1 m. The man is wearing a seat belt and harness. What is the average force exerted by the belt and harness during the crash?

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