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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8 N

15 N

20 N

Zero

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detailed solution

Correct option is B

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

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