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In the figure, mA = 3kg and mB = 4 kg. For what minimum value of F, A starts slipping over B:(g = 10 m/s2)

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24 N
56 N
36 N
20 N

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detailed solution

Correct option is B

maximum acceleration without slipping is 0.3 gTotal force required 0.3g(m1+m2)+0.5(m1+m2)g(m1+m2)g (0.3+0.5)8(m1+m2)=8(7)=56 N.

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