Question

A bullet of mass 10gm is fired with speed of 1000m/s from a freely hamging gun of mass 2kg calculate the recoil velocity of gun

Answer 1

Mass of bullet=0.01kg

Velocity=1000m/s

Mass of gun=2kg

m1u1+m2u2=m1v1+m2v2

0.01×0+2×0=0.01×1000+2×v2

0=10+2v2

0=10+(-2v2)

2v2=10

v2=5