You are an engineer working on a roller coaster ride. You need to calculate the potential energy and kinetic energy of a roller coaster car that weighs 1000 kg and reaches a height of 30 meters. What is the potential energy of the roller coaster car? If the roller coaster car reaches a speed of 25 m/s at the bottom of the ride, what is its kinetic energy at this point? (Units: potential energy - joules (J), mass - kilograms (kg), height - meters (m), kinetic energy - joules (J), speed - meters per second (m/s))
