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Two ivory balls are placed together at r...

Two ivory balls are placed together at rest. A third identical ball moving with velocity u in the line of first two balls, as shown in figure collide head on elastically then

A

Thrid ball comes to rest with second ball while first ball moves with speed u

B

Third ball comes to rest and other two move together with speed `(u)/(2)`

C

All three ball move together with speed `(u)/(3)`

D

All three ball move in such a manner each makes angle `120^(@)` to each other

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The correct Answer is:
A
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