The Speed Needed at the Bottom of a Loop-The-Loop Track

Multiple Choice

The speed needed at the bottom of a loop-the-loop track so that a car can coast to the top, with sufficient speed to stay on the track, depends on the mass of the car. (Neglect the effects of friction.)

A) sometimes true, since kinetic energy is a function of mass
B) never true
C) sometimes true, since potential energy is a function of mass
D) always true, since kinetic energy is a function of mass
E) always true, since potential energy is a function of mass