A block of mass 3kg is at rest on a rough inclined plane as shown in the figure. The magnitude of net force exerted by the surface on the block will be (g=10m/s2)
A
26N
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B
19.5N
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C
10N
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D
30N
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Solution
The correct option is D30N As the block is at equilibrium N=mgcos30∘=15√3N f=mgsin30∘=15N