Which of the following described qualitative data? a. recording the temperature of a solid as it is warmed. b. noting the color of a solution as it is heated. c. measuring the volume of an object by water displacement d. taking the mass of an object using balance.

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.