Physics kinematics

The break of a car can slow it down from 60 miles per hour to 40 miles per hour in two secs how long it bring the car to a stop from an initial velocity of 25 miles per hour at the same acceleration

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  1. a = (60-40)/2 = 20mi/hr-s
    So, to decelerate from 25 mi/hr to zero, it will take

    (25mi/hr)/(20mi/hr-s) = 1.25s

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  2. (60-40)/2 = 20/2 = 10
    so I get 2.5 seconds

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