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A machine gun fires a bullet of mass 40 g with a velocity `1200 ms^(-1)`. The man holding it, can exert a maximum force of `144 N` on the gun. How many bullets can be fired per second at the most?

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We have force `"mn"u` ltbr where `w=m `of bullet, `u =` speed ofbullet,
`=` number of bullets per unit time.
`:. F=mnu`
or `200=50/1000xx2000xxn`
Hence, number of bullets fired per minute
`=60xx2=120`
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