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7 October, 07:36

A car is moving at a speed of 60 m/s, when the driver applies the brakes, which causes a deceleration of 2 m/s2. How many seconds will it take for the car to stop and how far will it travel till it stops

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  1. 7 October, 07:44
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    Answer: 30s, 900m

    Explanation: once the break is applied, the car will decelerate and the car will come to rest.

    Since the car is coming to rest, final velocity (v) equals zero.

    Hence u = 60 m/s, a = - 2m/s²

    Recall that v = u + at

    0 = 60 + ( - 2) t

    2t = 60, t = 60 / 2 = 30s.

    To get the distance covered before the car comes to rest, we have the formulae below

    v² = u² + 2as

    0² = 60² + 2 (-2) s

    0 = 3600 - 4s

    4s = 3600

    s = 3600 / 4 = 900m
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