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Question

Bullets of 0.03 kg mass each hit a plate at the rate of 200 bullets per second with a velocity of 30 m/s. Their average force acting on the plate in newton is

A
120
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B
180
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C
300
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D
480
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Solution

The correct option is A 180
Average force on the plate is change in momentum per unit time.

F=nmvt=200×0.03×301=180N.

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