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23 March, 07:29

A car's speedometer reads 20 m/s after accelerating, from a standing start, for 25s. What was the magnitude of its acceleration?

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  1. 23 March, 07:30
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    Magnitude of acceleration = (change in speed) / (time for the change)

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

    = (20 m/s) - zero

    = 20 m/s

    Time for the change = 25 s

    Magnitude of acceleration = (20 m/s) / (25 sec)

    = (20/25) m/s²

    = 0.8 m/s²
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