An engineering student is gathering data on the motion of a model car traveling down a ramp. If energy is conserved, the potential energy of the car at the top of the ramp should equal the kinetic energy of the car at the bottom of the ramp. After the first trial, the student calculates that the kinetic energy at the bottom of the ramp is less than the potential energy at the top of the ramp. Which of the following can best explain this difference? A.
The student did not measure the increase in velocity.

B.
The measured height of the ramp was greater than the actual height.

C.
The student did not include the loss of heat energy.

D.
The measured mass of the car was greater than the actual mass.