A slab of mass 5 kg lies on a smooth horizontal surface a block of mass 4 kg on the top of it . coefficient of friction between the block and slab is 0.25. If the block is pulled horizontally by a force of F= 6N, what is the work done by the force of friction on the slab between the instance t = 2S to t=3S?(take g=10m/s²)
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