N bullet each of mass mkg are fired with a velocity `vms(-2)` at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

Options

A. nmv
B. `(Nmv)/(n)`
C. `n(Nm)/(v)`
D. `n(Nv)/(m)`

Answer

A

Explanation

Total mass of bullets=Nm, time `t(N)/(n)` .
Momentum of the bullets striking the wall=Nmv
Rate of change of momentum (Force) `=(Nmv)/(t)=nmv` .