What is the Recoil Speed of a Rifle Firing a Bullet?

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To calculate the recoil speed of a rifle firing a bullet, the conservation of momentum principle is applied. The rifle has a mass of 4.5 kg and fires a 10 g bullet at a muzzle speed of 820 m/s. The initial attempt at a solution incorrectly used the bullet's mass as 1000 kg, leading to confusion. It is essential to convert the bullet's mass from grams to kilograms for accurate calculations. The correct approach will yield the final recoil speed of the rifle based on the proper mass units.
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Homework Statement



A rifle has amass of 4.5 kg and it fires a bullet of mass 10 g at a muzzle spped of 820m/s what is the final recoil speed of the rifle as the bullet leaves the gun barrel?

Homework Equations



conservation laws

The Attempt at a Solution


4.5v=1000*820
v=1.8*10^5
 
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What? 0.0 The mass of the bullet is 10 grams, not 1000 kg. =D

Be consistent with your units, but your method is sound, I suggest converting your grams in kilograms.
 

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