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Newton's Second Law

Two blocks A ...

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Two blocks A and B are placed on each other .Mass of A is 5 kg while mass of B is 15 kg .Coefficient of friction between block A and B is 0.1 and between block B and the ground is 0.6 ,if a force of 80N is applied on block B find friction between Block A and B and between block B and the ground ? Take g= 10 meter per second square.

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