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since sphere is not slipping on the plank hence acc. of plank = acc. of the bottomost point. now let the acc. of centre of sphere be acm hence acm + Ralpha = acc. of bottomost point = acc. of plank hence acm = acc.of plank - Ralpha hence a) is correct b) is correct as friction is the only force causing movement of the sphere c) is correct as only external force is F hence ans is D) |
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