Question

A car running at 54km/h slows down to 36km/h over a distance of20 m.calculate retardation produced by its brakes and the time for which brakes are applied

Answer 1

final velocity in m/sec is 10 m/sec and initial velocity is 15 m/sec by 3rd equation of motion we get retardation = 3.125 or we can say acceleration =-3.125 then from 1st equation we get time =1.6 sec

Answer 2

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