Four identical balls A,B,C and D are pla...

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.

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The correct Answer is:

`V _(A) = u (to) ,V _(B) = 0, V _(C ) = 0 and V _(D) = u (to)`

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