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Q.

A block of mass 3 kg is kept on a frictional surface with μ=123. The minimum force to be applied as shown to move the block is

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a

5N

b

20 N

c

10 N

d

20/3 N

answer is B.

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Detailed Solution

N=mg+Fsin⁡θ,Fcos⁡θ=f,f=μN
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