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Q.

A block of mass 10 kg is kept on a rough inclined plane as shown in the figure. A force of 3 N is applied on the block. The coefficient of static friction between the plane and the block is 0.6. What should be the minimum value of force (in N) P, such that the block doesnot move downward ? (take g = 10 ms-2)

1330155

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answer is 31.28.

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Detailed Solution

mgsin45°=1002=502

μmgcosθ=0.6×mg×12=0.6×502

P=mgsinθ-μmgcosθ+3=202+3=31.28N

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