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A small block of mass m ,slides down a s...

A small block of mass m ,slides down a smooth incline plane of height h and moves some distance on rough horizontal surface before coming to rest.The coefficient of friction between block and horizontal surface is `mu` .The minimum work to be done on the block to it move it back to original position along the same path is: 1) mgh 2) 2mgh 3) 3mgh 4) `(1+mu)mgh`

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