A 3 kg ball is attached to a tree branch by a 2.0 m long rope....

A 3 kg ball is attached to a tree branch by a 2.0 m long rope. It is released from rest when the string is parallel to the ground. Just at it swings to its lowest point, it collides elastically head-on with a 2 kg ball of the same dimension, but going in the opposite direction. The 3 kg ball rebounds at a speed of 13 m/s after the collision. Find the speed of the 2 kg ball before the collision.

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genius_generous answered 2 years ago

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