A block of mass 20kg is placed on a rough horizontal surface having coefficient of friction 0.2 . If a horizontal force of 50n is applied on it, then the acceleration of the block will be (take 2 g m s 10 / )
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F - f = ma
50 - 0.2 × 10 × 20 = 20× a
50 - 40 = 20a
a = 10/20 = 0.5m/s*2
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