A billiard ball moving with a speed of 5...

A billiard ball moving with a speed of `5 m//s` collides with an identical ball, originally at rest. If the first ball stop dead after collision, then the second ball will move forward with a speed of:

`10ms^(-1)`

`5ms^(-1)`

`2.5 ms^(-1)`

`1.0ms^(-1)`

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The correct Answer is:

In elastic head on collision velocities gets interchanged

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