Four identical balls A,B,C and D are placed in a line on a frictionless horizontal surface. A and D are moved with same speed .u. towards the middle as shown. Assuming elastic collisions, find the final velocities.

Four identical balls A,B,C and D are placed in a line on a frictionles

1.	Four identical balls A,B,C and D are placed in a line on a frictionless horizontal surface. A and D are moved with same speed .u. towards the middle as shown. Assuming elastic collisions, find the final velocities.
Answer» ANSWER :`V _(A) = U (to) ,V _(B) = 0, V _(C ) = 0 and V _(D) = u (to)`