Elias stretches a rubber band and lets it go. the rubber band flies across the room. elias says this demonstrates the transformation of kinetic energy to elastic potential energy. is elias correct?

No, he is not.

Explanation:

When he let the rubber band go, the band compresses, so there's elastic potential energy in it, which will be transformed into kinetic energy when it gains velocity and flies across the room.

Then, Elias had inverted the concepts: the experiment demonstrates the transformation of elastic potential energy to kinetic energy.

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds