VI. A student attaches four drawing pins to a copper rod using candle wax as shown in the diagram The rod is then heated continuously at one end and the pins fall off in the order 4, 3, 2, 1​

Explanation:

i guess it’s a and b

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                                         : )