Question

A bullet of mass 50g is fired from a gun of mass 5kg with a velocity of 100m/s

Answer 1

M1 = Mass of bullet = 50 g = 0.050 kg

M2 = Mass of bullet = 5 kg

U1 = 0

U2 = 0

V1 = 100 m/s

V2 = ?

As we know ,

M1U1+M2U2 = M1V1+ M2V2

0+0 = 0.050×100+5×V2

0 = 5+5×V2

-5= 5V2

V2 = -1 .

The final Velocity of the gun is -1 m/s.

Answer 2

Mass of bullet = 50g = 0.050kg
Mass of gun = 5kg
Velocity of bullet = 100m/s

Acc. to law of conservation of momemtum,

Recoil velocity of gun = m/M ×v

= 0.050/5 × 100
=-1 m/s