Two identical bullets are fired one by a light rifle and another by a heavy rifle with the same force. Which rifle will hurt the shoulder more and why ?

Light rifle

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Heavy rifle

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Both of them will hurt equally

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None of these

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Solution

The correct option is A Light rifle
The two identical bullets recoil with the same force, but the lighter one will accelerate faster than the heavier one.
We can use Newton's third law to explain better: If $F_{l} a n d F_{H}$ are the forces exerted on the rifles, we have
$F_{l} = F_{h}$
or $M_{1} < M_{h}$ and $a_{1} > a_{h}$ .
The lighter rifle hurts more than a heavier rifle as the acceleration is higher.

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