Chapter 8, Problem 45PE

Two identical pucks collide on an air hockey table. One puck was originally at rest. (a) If the incoming puck has a speed of 6.00 m/s and scatters to an angle of 30.0°,what is the velocity (magnitude and direction) of the second puck? (You may use the result that ${\theta }_1-{\theta }_2=90°$ for elastic collisions of objects that have identical masses.) (b) Confirm that the collision is elastic.