An Automatic Rifle Fires 0

Multiple Choice

An automatic rifle fires 0.040-kg projectiles at a speed of 800 m/s.If the gunner holding the rifle in her hands can exert an average force of 160 N against the gun,the maximum number of projectiles she can fire in one minute is

A) 15
B) 300
C) 800
D) 4000
E) 48,000