physics

A 20kg block is initially at rest on a rough, horizontal surface. A horizontal force of 75N is required to set the block in motion. After it is in motion, a horizontal force of 60N is required to keep the block moving with constant speed.
Find the coefficient of static and kinetic friction from this information.

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  1. weight = m g
    friction force = mu m g
    so
    static mus
    75 = mus (20)(9.81)
    and
    kinetic muk
    60 = muk (20)(9.81)

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