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Q.

The minimum force required to move a body up an inclined plane is three times the minimum force required to prevent it from sliding down the plane. if coefficient of friction between the body and inclined plane is 123 ,the angle of inclined plane is

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a

60°

b

45°

c

30°

d

15°

answer is C.

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Detailed Solution

Fup=3Fdown

mgsinθ+μkcosθ=3mgsinθ−μkcosθ4μkcosθ=2sinθ

4μk=2tanθ

2.123=tanθ

tanθ=13

θ=30°

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