Posted by sarah on .
A cue ball initially moving at 4.3m/s strikes a stationary eight ball of the same size and mass. After the collision, the cue ball’s final speed is 2.3 m/s at angle 1 with respect to it's original line of motion. The 8 ball moves with unknown speed at an angle 2 unknown with respect to its original line of motion below the horizontal.
Find the cue ball’s angle 1 with respect to its original line of motion above the horizontal. Consider this to be an elastic collision (ignoring friction and rotational motion).

college physics 
Anonymous,
Two 2.5 kg masses are 2.5 m apart on a frictionless table. Each has +1.5 µC of charge.