What force will change the velocity of a body of mass 1 kg from 20 $m s^{- 1}$ to 30 $m s^{- 1}$ in two seconds?

1 N

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5 N

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10 N

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25 N

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Solution

The correct option is A 5 N
From newton's second law, $F = \frac{d P}{d t}$
dP= d(mv)
So, required force $F = \frac{1 (30 - 20)}{2} N$
so $F = 5 N$

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