a block of wood is pulled by a horizontal string across a rough surface at a constant velocity with a force of 20N. the coefficient of kinetic friction between the surfaces is 0.3 the force of the friction is

6 N

Explanation:

From the laws of friction

F = ¶R = 0.3 × 20 = 6 N

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show the wavelengths of a wave. show the crests of a wave.