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Question

A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction 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
10 N
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Solution

The correct option is A 0.98 N
The maximum frictional force can be 5\times 0.5=2.5N
But the frictional force is only balancing the weight of the object, so it's value will be 0.98 N.

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