AP EAMCET202124 Aug 2021Evening ShiftPhysicsCenter of Mass, Momentum and CollisionActual
A bullet of mass m is fired from a rifle of mass M . If v be the velocity of the bullet, velocity acquired by the rifle is
Options
- Av _r= -M m v
- Bv _r= -m M v
- Cv _r=- v
- Dv _r=+ v
Correct answer
B. v _r= -m M v
Step-by-step solution
Given that, mass of bullet =m Mass of rifle =M Velocity of bullet = v Let velocity of rifle = v _r By using conservation of linear momentum m v +M v _r=0[ Initial momentum of bullet and rifle was zero] v _r= -m v M Here - ve sign shows that velocity of rifle is opposite to the velocity of bullet.