A) One
B) Four
C) Two
D) Three
Correct Answer: D
Solution :
| [d] The force is measured as the time rate of change of momentum we have to remembered that momentum and force both are vector quantity. |
| The force exerted by machine gun on man's hand in firing a bullet = Change in momentum per second on a bullet or rate of change of momentum |
| \[=\left( \frac{40}{1000} \right)\times 1200\] |
| \[=48\,N\] |
| The force exerted by man on machine gun= Force exerted on man by machine gun = 48 N |
| Hence, number of bullets fired\[=\frac{144}{48}=3.\] |
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