Three balls `A, B` and `C` of same mass `m` are placed on a frictionless horizontal plane in a straight line as shown. Ball `A` is moved with velocity `u` towards the middle ball `B`. If all the collisions are elastic, find the final velocities of all the balls.
Text Solution
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A collides elastically with `B` and comes to rest but `B` starts moving with velocity `u`. After a while `B` collides elastically with `C` and comes to rest but `C` starts moving with velocity `u`. Therefore, final velocities, `V_(A)=0, V_(B)=0` and `V_(C)=u`.
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