An average force of \( 125 \, \text{N} \) is applied on a machine gun firing bullets each of mass \( 10 \, \text{g} \) at the speed of \( 250 \, \text{m/s} \) to keep it in position. The number of bullets fired per second by the machine gun is:
\( 5 \)
\( 100 \)
\( 50 \)
\( 25 \)
