Question

A 10g bullet is fired from a 5kg gun with a velocity of 400m/s. What is the speed of recoil of the gun?

Answer 1

10g=0.01kg

Mass of bullet*velocity =mass of gun*velocity of gun

This equation is derived from momentum conservation.

0.01*400=5*v

V=0.8.
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Answer 2

We will use the formula of Conservation of momentum.

5 kg * v = 0.010 kg * 400 m/s
v = 4/5
v = 0.8 m/s

Recoil velocity will be 0.8 m/s.