A mass is suspended vertically from a spring. The mass is lifted up to point P and then let go. The mass then moves back and forth repeatedly between point P and a lower point Q. Which energies alternately rise and fall during the oscillations?
- Agravitational potential energy, kinetic energy and elastic energy
- Bgravitational potential energy and kinetic energy only
- Cgravitational potential energy, kinetic energy and internal energy
- Dinternal energy and elastic energy