A machine gun fires n bullets per second and the mass of each bullet is m. If v is the speed of each bullet then the force exerted on the vehicle is

A) mng B)mnv

C) mnvg D)mnv/g

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First we have to determine the units of Force.

Force = mass * acceleration

Force = Newton = (kg-m)/(s^2)

Mass of each bullet = m

The number of bullets fired per seconds = n

The velocity of each bullet = v

We can say that the force applied on the vehicle can be expressed as = mnv

We can see that the units of force fits with the expression **mnv. **The answer is therefore letter** B. mnv**

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