Question

Two ivory balls are placed together at rest. A third identical ball moving with velocity u in line of first two balls:as shown in figure collide head on elastically then(1)Third ball comes to rest with second bail while first ball moves with speed u(2)Third ball comes to rest and other two move together with speed(3) All three ball move together with speed(4) All three ball move in such a manner each makes angle 120° to each other​

Answer 1

Answer:

third ball comes to rest with second ball while first ball moves with speed u

Answer 2

Answer:

Option (1) Third ball comes to rest with second bail while first ball moves with speed u.

Explanation:

It is given that all the balls are identical and collide elastically which implies that their velocities and energy could be transferred.

So, when 3rd ball collides with 2nd ball, it transfers its velocity to it. Later, when 2nd ball collides with 1st ball in touch, it transfers the same velocity obtained from 3rd ball.

Hence, the third ball comes to at rest and the 1st ball moves with speed u.

Hope it helps! ;-))