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2 DYNAMICS

P20 011

A car of mass 1000 kg travelling on a horizontal surface at velocity 30 m.s^-1 collides with a crash barrier and comes off intact travelling at 10 m.s^-1 as shown in the diagram. The impact with the crash barrier lasted 4.0 s. What is the magnitude and direction of the average force of the crash barrier acting on the car during this time interval of 4.0 s?

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Solution