PLEASE HELP IM DESPERATE- what is the same and different about these two parabolas

Convection occurs when thermal energy is transferred by the movement of

Which describes increasing the efficiency of energy resource

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.