Q.

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

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a

50 N

b

30 N

c

25 N

d

40 N

answer is D.

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Detailed Solution

F=10×4=40NfL=μmg=0.5×10×10=50N∵Fapplied 
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The friction force acting on the block at time t = 4s will be