$N$ bullets,each of mass $m \, kg$,are fired with a velocity $v \, m/s$ at the rate of $n$ bullets per second upon a wall. The reaction force offered by the wall to the bullets is given by:
- A$nmv$
- B$\frac{Nmv}{n}$
- C$n \frac{Nm}{v}$
- D$n \frac{Nv}{m}$
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