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29 October, 03:55

A race car's velocity increases from 2.0 m/s to 60 m/s over a 4.0-s time interval. What is its average acceleration

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  1. 29 October, 06:41
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    The size of the acceleration is

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

    Change in speed = (60 m/s - 2 m/s) = 58 m/s

    Time for the change = 4.0 s

    Size of the acceleration = (58 m/s) / (4.0 s) = 14.5 m/s².

    We don't know the direction of the velocities, so we can't say anything

    about the direction of the acceleration.
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