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Q.

If a block of mass 10kg is pushed on a rough horizontal surface with an initial velocity of 8m/s, it comes to rest in 2 sec. In order to move this body with the same speed 8m/s on the same surface, the force required is

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a

40 N

b

100 N     

c

zero     

d

80 N       

answer is D.

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Detailed Solution

Stopping force on the block  =ΔpΔt=10(0−8)2=−40N

  to pull it with constant speed, the same force is to be applied.

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