A 2000-kg car traveling at 90 km/h crashes into a concrete wall that does not give at

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A 2000-kg car traveling at 90 km/h crashes into a concrete wall that does not give at all.

(a) Estimate the time of the collision, assuming that the center of the car travels halfway to the wall with constant deceleration. (Use any reasonable length for the car.)

(b) Estimate the average force exerted by the wall on the car.

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