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

1 Answer

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jerichorayel | College Teacher | (Level 2) Senior Educator

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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