Now test your predictions using the PhET sim. Hit More Data to bring up the data table on the bottom of the sim. Enter the masses in the first column, and the initial velocities in the Vx column. The y and Vy columns should remain zero to keep the in one dimension. The momentum for each ball can be found in the Px column - a together to check p.. . Once the sim is set up, hit play and pause it after the collisi before either ball bounces off one of the side walls. After confirming the post-collisi velocities, rewind and try the next setup. Did your experimental results match your calculations? (Hint: They should - if not, go back and check your math!)