This roller coaster’s track is nearly frictionless, so resistance can be ignored. Using g is equal to 9 point 8 the fraction with numerator m and denominator s squared , what best describes the roller coaster car when it is at the top of the loop-de-loop?
Answer
A
The car has both potential and kinetic energy, and it is moving at 34.9 meters per second .
B
The car’s potential energy has all been converted to kinetic energy, so it moves at 42.7 meters per second .
C
The car has only potential energy, so it is moving at 0 meters per second .
D
The car has both potential and kinetic energy, and it is moving at 24.6 meters per second .