A white billiard ball with mass mw = 1.57 kg is moving directly to the right with a speed of v = 3.36 m/s and collides elastically with a black billiard ball with the same mass mb = 1.57 kg that is initially at rest. The two collide elastically and the white ball ends up moving at an angle above the horizontal of θw = 39° and the black ball ends up moving at an angle below the horizontal of θb = 51°.
1)What is the final speed of the white ball?