Question

A kiddie roller coaster car has a mass 100 kilograms. At the top of a hill, it’s moving at a speed of 3 meters/second. After reaching the bottom of the hill, its speed doubles. The car’s kinetic energy at the bottom is what?

Answer 1

(1/2)mv^2 = (1/2) * 100 * (2*3)^2 = 1800 [J]