Question

When traveling at top speed, a roller coaster train with a mass of 12,000 kg has a velocity of 30 m/s. The kinetic energy of the train at top speed is
J.

Answer 1

K = 1/2 mv^2 = 1/2 (12,000 kg)(30 m/s)^2 = 0.5 × 12,000 × 900 = 5,400,000 J (5.4 × 10^6 J).