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Question

A machine gun is mounted on a 2000kg car on a horizontal frictionless surface. At some instant the gun fires bullets of mass 10g with a velocity of 500m/sec with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is:

A
550newton
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B
50newton
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C
250newton
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D
250dyne
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Solution

The correct option is A 50newton
F=mnV where n is the no of bullets fired per sec
F=(10×103)×10×500=50N

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