How much kinetic energy does a roller coaster have if its mass is 3000 kg and is moving at 30 ms?

The kinetic energy of the roller coaster can be calculated using the formula KE = 0.5 * mass * velocity^2. Plugging in the values, KE = 0.5 * 3000 kg * (30 m/s)^2 = 1,350,000 Joules.