Question: Six identical balls are linked in a straight groove made on a horizontal frictionless surface as shown. Two similar balls each moving with a velocity 𝑣 collide elastically with the row of 6 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 with speed 𝑣 each and the remaining balls will remain stationary
(C) All the six balls in the row will roll out with speed 𝑣/6 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
Answer: Option (B)
Solution:
