What is the kinetic energy of a roller coaster car that has a mass of 482kg that is descending from the highest peak of the coaster which is known to be 75m tall and has a velocity of 37.9 m/s? The gravitational acceleration is 9.81 m/s2.
The kinetic energy has nothing to do with how high it is or the value of g. All that matters is mass and speed.
Ke = (1/2) m v^2 = (1/2)(482)(37.9)^2 Joules