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A 2000 kg car traveling at 90 km/hr crashes into a concrete abutment causing the front...

A 2000 kg car traveling at 90 km/hr crashes into a concrete abutment causing the front end to collapse 0.40 m. Assume an inelastic collision and estimate (a) the duration of the collission in secs and (b) the average impulsive force of the abutment on the car in kN.
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