A body of mass 10 kg is moving on a horizontal surface by applying a force of 10 N in the forward direction. The body moves with a constant velocity of 0.2 m s - 1 . Work done by the force of friction in the first 10 seconds is

Question

A body of mass 10 kg is moving on a horizontal surface by applying a force of 10 N in the forward direction. The body moves with a constant velocity of 0.2 m s - 1 . Work done by the force of friction in the first 10 seconds is, - 20 J, 10 J, 20 J, - 5 J

MARKS App · Accepted Answer

Since, body moves with constant velocity. So, net force on the body is zero. Here, N = mg F = f ∴ W = f → · s → = fs cos 180 ° = – fs = –10 × 2 = –20 J

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