Answers please help me I need to pass this class

Distinguish between a transverse wave and a longitudinal wave.

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?