Question

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

• A. one ball from the right end will move on with speed 2v and all the remaining balls will be are rest
• 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 will speed v/8
• D. all the six balls originally at rest will move on with speed v/6 and the incident balls will come to rest

Answer 1

The correct option is B two balls from the extreme right end will move on with speed v and the remaining balls will be at rest

1) B collides with C & stops & this velocity is passed on to E
2) Now A strikes B & then the again velocity is passed to last ball i.e D