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Q.

A body of mass 5 kg moving on a horizontal surface with a velocity of 10 ms^-1 comes to rest in 2s. The force required to make this body move with a velocity of 10 ms^-1 on the same surface is

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a

Zero

b

10 N

c

25 N

d

50 N

answer is C.

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Detailed Solution

The friction is responsible for the retardation.

$a = \frac{10}{2} = 5 {ms}^{- 2} \Rightarrow f = ma = 25 N$ .

So the force required to keep the body move with a constant velocity must be F=f=25N

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A body of mass 5 kg moving on a horizontal surface with a velocity of 10 ms-1 comes to rest in 2s. The force required to make this body move with a velocity of 10 ms-1 on the same surface is