1.

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 byA. nmvB. `(Nmv)/(n)`C. `n(Nm)/(v)`D. `n(Nv)/(m)`

Answer» Correct Answer - A
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` .


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