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(b)A bock of mass 2 kg moving on a horizontal surface with speed of 3 ms enters roughpatch ranging from x-0.20 m to 1.50 m. The retarding force F, on the block in this range isgiven by Fr=-kx2 0.20<x<1.50F, = 0x 0.20 m and x> 1.50 m . Calculate work done by retarding forcewhere k is constant equals to 50 J m.(3M)

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