Distance ball will land?

[jumpingjack90]

Distance ball will land??

Homework Statement

-Deleted Post thanks!
thanks for help! attained answer.

Homework Equations

The Attempt at a Solution

 

[kuruman]

You start by using energy conservation to find the speed of the ball just before it hits the other one. The kinematic equation that you wrote down does not work in this case because the acceleration of the pendulum ball is not constant.