A ball with a mass of #2 kg# is rolling at #4 m/s# and elastically collides with a resting ball with a mass of #4 kg#. What are the post-collision velocities of the balls?
The velocity of the first ball is
The velocity of the second ball is
The velocities before the collision are
The velocities after the collision are
Solving the above 2 equations for
Taking the direction as positive