A red car and a yellow car drive up a hill, both slowing down as they climb the hill. The gravitational potential energy for both cars increases by 25 joules. The engine of the red car does 29 joules of work and the engine of the yellow car does 27 joules of work. For which car does the mechanical energy increase more?
A car drives up a hill, slowing down as it climbs the hill. The kinetic energy of the car decreases by 12 joules and the gravitational potential energy of the car increases by 21 joules. What is the change in the mechanical energy of the car?
A car drives down a hill at a constant speed. How does the mechanical energy for the car change?