A machine gun is mounted on a flat railroad car. The gun is firing bullets at the rate of 10 bullets per second each of mass 10 g. The bullets are fired at velocity 500 ms -1 relative to the car. Calculate the acceleration and force of car at the instant when its mass is 200 kg.
Text Solution
Verified by ExpertsThe correct answer is:
A
Here, reacting force = relative velocity × 
= 500 × 
(taking time = 1 s)
Using F = ma, we get
a = 
= 0.25 ms -2
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