physics

4N force applied on a body mass 20kg then calculate work done in 3sec?

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  1. work = force * distance so how far?
    assume v =0 at start

    F = m a
    4 = 20 a
    a = (1/5) m/s^2

    v = Vi + a t
    v = 0 + 3 a

    x = Xi + Vi t + (1/2) a t^2
    x = 0 + 0 + (1/2)(9)
    x = 4.5 meters

    so
    W = F x = 4 * 4.5
    = 18 Joules

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