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1 October, 01:35

A car traveling at 40 m/s starts to decelerate steadily. It comes to a complete stop in 5 seconds. What is its acceleration? m/s2

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  1. 1 October, 02:05
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    Acceleration =

    (change of speed) / (time for the change).

    Change of speed = (speed at the end) - (speed at the beginning)

    = (zero) - (40 m/s)

    = - 40 m/s.

    Acceleration = (-40 m/s) / (5 seconds)

    = - 8 m/s².
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