Continental drift is? A:The movement of large land areas across earth's surface

B:The current that pushed Wegners hot air balloon

C:The movement of animals from Africa and South America ​

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.