A racehorse is running at 42 miles per hour, equivalent to 18.8 meters per second. The horse and its jockey have a combined mass of 512 kilograms How much kinetic energy do they have?
180.961.3J
451,584.0J
4,812.8J
90,480.6J
(1 point)
KE - 1/2 * m * v ^ 2
The correct answer is 451,584.0J.
KE = 1/2 * m * v^2
KE = 1/2 * 512kg * (18.8m/s)^2
KE = 451,584.0J