Question

A horizontal force of 20 newton is required to keep a body moving in horizontal direction with constant velocity. What is the work done by the frictional force and the displacement of the body is 2 metre.

Answer 1

Here the force donot accelerates the body
20N is required to keep the body in uniform velocity
so 20N force is acting oposit to the motion of the body by the friction
so for a displacement of 2m work done by frictional force=2×20=40

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