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12 November, 19:46

Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/a in 20 s. What is te net force acting on the body?

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  1. 12 November, 19:48
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    The guy below is wrong!

    F=ma

    Where force = mass x acceleration

    We dont have acceleration, a = change in velocity divided by the time taken.

    a = v (final velocity) - u (initial) / t

    a us 8-0 (at rest means u was 0) / 20 = 0.4

    Using F=ma

    F = mass x acceleration

    F = 4 x 0.4

    F=1.6 N
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