Density of water is 1000 kg/m3 and that of glass is 2500 kg/m3 . The speed of light will be maximum in 1.Water

2.Glass

3.Same in both

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )