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Question

A block of mass 0.1 kg is held against a wall applying a horizontal force of 5 N of the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is


A

2.5 N

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B

0.98 N

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C

4.9 N

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D

0.49 N

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Solution

The correct option is B

0.98 N


Since the block is stationary, friction balances the weight of the block.
Hence, f = mg = 0.1 × 9.8 = 0.98 N


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