Two balls X and Y are moving towards each other with speeds of $5m{s^{ - 1}}$ and $15m{s^{ - 1}}$ respectively.
They make a perfectly elastic head-on collision and ball Y moves to the right with a speed of $7m{s^{ - 1}}$.
What is the speed and direction of ball X after the collision?
1 )
$3m{s^{ - 1}}$ to the left
$13m{s^{ - 1}}$ to the left
3 )
$3m{s^{ - 1}}$ to the right
4 )
$13m{s^{ - 1}}$ to the right
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