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Questions  

A box of mass 4 kg is placed on a rough inclined plane of inclination 60°. Its downward motion can be prevented by applying an upward pull is F and it can be made to slide upwards by applying a force 3F. The coefficient of friction between the box and inclined plane is

a
23
b
32
c
12
d
12

detailed solution

Correct option is B

F1=mgsin⁡θ−μkcos⁡θF2=mgsin⁡θ+μkcos⁡θ

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