Questions  

The friction force acting on the block at time t = 4s will be

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By Expert Faculty of Sri Chaitanya
a
50 N
b
30 N
c
25 N
d
40 N
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detailed solution

Correct option is D

F=10×4=40NfL=μmg=0.5×10×10=50N∵Fapplied 

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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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