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

Options

A. one ball from the right end will move on with speed `v`
B. two balls from the extreme right end will move on with speed `v` and the remaining balls will be at rest
C. all the balls will start moving to the right with speed `v//8`
D. all the six ball originally at rest will move on with speed `v//6` and the incident calls will come to rest

Answer

B