N bullets each of mass m kg are fired with a velocity $v {ms}^{- 1}$ at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

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nmv

$\frac{Nmv}{n}$

$n \frac{Nm}{v}$

$n \frac{Nv}{m}$

answer is A.

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Detailed Solution

Total mass of bullets = Nm, time $t = \frac{N}{n}$
Momentum of the bullets striking the wall = NmV
Rate of change of momentum (Force) $= \frac{Nmv}{t} = nmv .$

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