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Question

A block of mass 2 kg is resting on a rough inclined plane of inclination 30. If the coefficient of friction is 0.8, the resultant contact force between incline and the block is (g=10 ms2)

A
20 N
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B
10 N
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C
103 N
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D
None of these
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Solution

The correct option is A 20 N
As the block is at rest, the net contact force on the block i.e. resultant of friction and normal reaction must balance the weight of the block. Hence R=mg=20 N


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