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 $30^{{}^{\circ}}$ . How high does the bob X rise immediately after the collision?

Question

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^{{}^{\circ}}

. How high does the bob X rise immediately after the collision?

Quantrex Academy · Accepted Answer

Correct answer: D. It stops at position B

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.

A metallic bob X of mass m is released from position It collides...

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