Rifle ని fire chesinappudu, bullet velocity ekkuva unte, rifle recoil kuda antha ekkuve untadi. Bullet 800 m/s tho vellindi anukundam, mass 0.01 kg; naa rifle mass 4 kg ayithe, rifle recoil velocity 2 m/s avuthadi (0.01*800 = 4*v). Calculations clear ga chepputhayi. Kani ground lo, నా shoulder pain chuste, momentum conservation theory ki practical lo ekkuva force undi anipisthundi — rifle ఒక్కసారి నా body ni backwards ga dhakkesthundi, theory numbers lo kanapadani feeling.
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