Answer to Question #340477 in Classical Mechanics for Yankee

Question

determine the kinetic energy of a 125kg roller coaster that is moving with a speed of 20.0 m/s

Answer 1

The kinetic energy is given by

$$E_k=\frac{mv^2}{2}$$

$$E_k=\rm\frac{125\: kg*(20.0\: m/s)^2}{2}=25\:000\: J$$