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A small ball of mass 0.1kg is attached t...

A small ball of mass `0.1kg` is attached to a `l=1m` long attached and is hung to a horizontal peg. The small ball is at rest and another small ball of mass `0.2kg` is projected from the ground and collides with it, such that the collision is totally elastic and head on, and after the collision the ball at the end of the thread oscillates with an angular amplitude of `90^(@)`. The distance between the peg and the ground is `2l`. What is distance `x` (in cm) shown in the figure?

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