Four identical balls are lined in a straight grove made on a horizontal frictionless surface as shown. Two similar balls each moving with a velocity v collide elastically with the row of 4 balls from left. What will happen
(A) One ball from the right rolls out with a speed 2v and the remaining balls will remain at rest.
(B) Two balls from the right roll out speed v each and the remaining balls will remain stationary.
(C) All the four balls in the row will roll out with speed v (v/4) each and the two colliding balls will come to rest.
(D) The colliding balls will come to rest and no ball rolls out from right.
