When a block of mass 20 kg is pushed along a rough surface witha force of 80N, it continues to move with a constant velocity. The force required to push the block along the same rough surface so that it moves with a constant acceleration of 0.4 m/s² is....
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force required to move a block on smooth surface = 20 x 0.4 = 8 N
force required to move the block on rough surface = 80 + 8 = 88 N
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