Question

which of these observations provide evidence that an energy change has occurred? choose 2 answers: a two objects interact without making a sound. b two repelling objects remain at rest. c an objects temperature changes. d an object slows down.

Explanation:

• Option A: No sound doesn't mean no energy change, but it doesn't directly show energy change either.
• Option B: Repelling objects at rest have no obvious energy - related change in this state.
• Option C: A change in an object's temperature implies a change in its internal energy, which is evidence of an energy change.
• Option D: An object slowing down means a change in its kinetic energy, which is evidence of an energy change.

Answer:

C. An object’s temperature changes.
D. An object slows down.