NDA2024General AbilityGeneral ScienceActual
A metallic bob X of mass m is released from position It collides elastically with another identical bob Y placed at rest at position B on a horizontal frictionless table. The angle AOB is 30^ . How high does the bob X rise immediately after the collision?
Options
- ATo the same height as that of position A on the other side in the same trajectory
- BTo half the height as that of position A on the other side along the same trajectory
- CThe same height at position A
- DIt stops at position B
Correct answer
D. It stops at position B
Step-by-step solution
When two bodies of same mass undergo elastic collision, their velocities are just interchanged. After collision bob X will come to rest and bob Y would move with velocity of X and will rise to the same height.