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12 July, 21:22

A car slows to a stop in 5 seconds. if it was going 80 km/hr find the acceleration.

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  1. 12 July, 21:42
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    Given

    time (t) = 5 seconds

    Initial speed (u) = 80 km/hr = 22.2222m/s

    final speed (v) = 0 km/hr = 0m/s

    Note I change to m/s so as to be consistent with units

    formula: V=U+at where a is acceleration

    0=22.2222+5a

    a=22.2222/5

    acceleration = 4.44444 m/s^2
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