Two identical ball bearings in contact with each other and resting on a frictionless table are hit head on by another ball bearing of the same mass moving initially with a speed v, figure,. If the collision is elastic, which of the following is a possible result after collisioin?

Options

A.
B.
C.
D.

Answer

B

Explanation

As the ball bearings are identical,their masses are equal. In elastic collision, their velocities are interchanges. In collision between 1 and 2, ver. Of 1 becomes zero and vel. Of 2 becomes `V`. In collision between 2 and 3, vel. Of 2 becomes zero and vel. of 3 becomes `V`. Choice (b) is correct.