The bQB A of a pendulum released from 30° to the vertical hits another bQB B of the same mass at rest on a table as shown in Fig. 6.15. How high does the bQB A rise after the collision? Neglect the size of the bQBs and assume the collision to be elastic.

Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with a speed VL If the collision is elastic, which of the following figure is a possible result after collision?