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Q.

Two blocks A,B of masses 20kg and 10kg are arranged on a horizontal frictionless table as shown in figure. The coefficient of friction between two blocks is 0.4. The maximum horizontal force that can be applied on the smaller block, so that the blocks move together is …………………N (g=10m/s2)

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answer is 60.

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Detailed Solution

fmax=μN=0.4×10g = 40Namax=40N20kg=2m/s2F = (10+20)×2=60 N

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