The time, in which a force of 4 N produces a change in momentum of 0.4 kg m $s^{- 1}$ in the body is:

0.1 s

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0.02 s

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0.5 s

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0.05 s

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Solution

The correct option is A 0.1 s
Impulse $=$ change in momentum
or $F t = 0.4$
or $t = 0.4 / F = 0.4 / 4 = 0.1$ sec

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