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(C) When two particles of equal mass undergo a head-on perfectly elastic collision,they exchange their velocities.In this scenario,the two moving ball

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two balls from the extreme right end will move on with speed $V$ each and the remaining balls will remain at rest

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(C) When two particles of equal mass undergo a head-on perfectly elastic collision,they exchange their velocities.In this scenario,the two moving balls collide with the first ball of the stationary row. Because the masses are identical and the collision is perfectly elastic,the momentum and kinetic energy are transferred through the chain.The first moving ball transfers its velocity $V$ to the first stationary ball,which then transfers it to the next,and so on,until the velocity reaches the end of the row.Since there are two incoming balls,this process happens for both. Consequently,the two balls at the extreme right end of the row will move off with speed $V$ each,while the remaining balls (the original six plus the two incoming ones) will come to rest.

Six steel balls of identical size are lined up along a straight frictionless groove. Two similar balls moving with a speed $V$ along the groove collide with this row on the extreme left end. Then:

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