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Q.

A cube of weight 10N rests on a rough inclined plane of slope 3 in 5. The coefficient of friction is 0.6. The minimum force necessary to start the cube moving up the plane is

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a

5.4N

b

10.8N

c

2.7N

d

18N

answer is B.

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Detailed Solution

F=ma,F=mgsin⁡θ+μkcos⁡θ
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