A sled starts atop a hill at rest with 3,000 J of potential energy relative to the bottom of the hill. When the sled reaches the bottom of the hill it has 2,000 J of kinetic energy. Why does the sled have less energy at the bottom of the hill than at the top?

A) The hill isn't very steep.
B) Some of the energy is destroyed.
C) Some of the energy is converted to heat.
D) The sled does 1,000 J of work on the hill.

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?