A machine gun can fire 200 bullets/min. If 35 g bullets are fired at a speed of 750 m/s, then the average force exerted by the gun on the bullets is 

Options

A. 87.5 N
B. 26.2N
C. 78.9 N
D. 110.3 N

Answer

A

Explanation

Mass of bullet `=35" g"=(35)/(1000)" kg"`
Number of bullets per second `=(200)/(60)=(10)/(3)5^(-1)`
Speed of bullet = 750 m/s
`:.` Force exerted by gun on bullets,
`F=(35)/(1000)xx(10)/(3)xx750=35xx2.5=87.5" N"`