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Q.

A block of mass 5 kg is placed on a rough horizontal plane. A time dependent horizontal force F = (t2+2t)N acts on the block. The friction force between the block and the plane at t = 3 s is (μ=0.4)

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a

8 N

b

15 N

c

20 N

d

Zero

answer is B.

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Detailed Solution

F=t2+2tfL=μmg=0.4×5×10=20N if t=3F=32+2×3N=15N
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