Two magnets are held close together with like poles facing. One magnet is fixed and the other is attached to a trolley that is initially at rest. The trolley is released and rolls away along a level track. Friction is negligible. Energy is transferred from the magnetic energy store of the magnets. Which energy store receives this energy?
The gravitational potential energy store of the trolley and Earth
The kinetic energy store of the trolley
The elastic potential energy store of the trolley
The electrostatic energy store of the magnets