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Q.

A block rest on a rough inclined plane making an angle 300 with the horizontal.  The coefficient of static friction between the block and plane is 0.8.  If the frictional force on the block is 10N, the mass of block is (g=10ms-2)

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a

1.6 kg

b

4 kg

c

2 kg

d

2.5 kg

answer is C.

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Detailed Solution

if μ is 0.8 angle of inclination is less than angle of repose and it is stationary  frictional force is eaual to applied force = mgsinθ=10 m(10) 0.5=10 m=2
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