A machine gun is mounted on a 2000 kg car on a horizontal frictionless surface. At some instant the gun fires bullets of mass 10 gm with a velocity of 500 m/sec with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is
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u = velocity of bullet
\overline{dm} = \overline{\overline{dt}} Mass thrown per second by the machine gun
= Mass of bullet × Number of bullets fired per second
\(= 10\ g \times 10\ bullet / sec\) \(= 100 \text{ g/sec} = 0.1 \text{ kg/sec}\)
Thrust \(= \frac{udm}{dt} = 500 \times 0.1 = 50 \text{ N}\)
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