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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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40 N

100 N

zero

80 N

answer is D.

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Detailed Solution

Stopping force on the block = $\frac{Δ p}{Δ t} = \frac{10 (0 - 8)}{2} = - 40 N$

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

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