KVPY2012PhysicsCenter of Mass, Momentum and Collision
A clay ball of mass m and speed v strikes another metal ball. of same mass m , which is at rest. They stick together after collision. The kinetic energy of the system after collision is -
Options
- Amv ² / 2
- Bmv ² / 4
- C2 mv ²
- Dmv ²
Correct answer
B. mv ² / 4
Step-by-step solution
Applying the law of conservation of momentum, mv +0=(2 ~m ) v ^ v ^ = v / 2 ~K . E = 1 2 (2 ~m ) v ^ 2