car increasing speed. bus parked in a garage. ball kicked along a flat surface. roller coaster slowing down on an incline.
I gave my students this multiple choice question: The best example of balanced forces is a

Only one answer is correct among these 4 choices:
- car increasing speed.
- bus parked in a garage.
- ball kicked along a flat surface.
- roller coaster slowing down on an incline.

Could you tell me which one is correct?

bus parked in a garage.