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2a 36. A large slab of mass 5 kg lies on...

2a 36. A large slab of mass 5 kg lies on a smooth horizontal surface, with a block of mass 4 kg lying on the top of it. The coefficient of friction between the block and the slab is 0.25. If the block is pulled horizontally by a force of F = 6 N, the work done by the force of friction on the slab, between the instants t = 2 s and 1 = 3 s, is (8 = 10 ms 4 kg 5kg a. 2.4J Fig. 8.233 b. 5.55Jc. 4.44 J d. 10 J

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