Answer :

Coefficient of friction, μ = 0.20

Weight of the block = 10 N

Height of the point A, h = 1.0 m

Frictional force exerted on the block by the rough surface, F = μ × weight of the block

= 0.20 × 10

= 2 N

Let the displacement of the box from point A be s

Loss in potential energy = Work done by the frictional force = Fs

Weight of the block × h = 2 × s

10 × 1 = 2 × s

s = 5 m

The block will move 5 m before stopping on the rough surface.

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