ball with a mass of 5 kg ball with a mass of 10 kg ball with a mass of 15 kg ball with a mass of 20 kg
I gave my students this multiple choice question: Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion?

Only one answer is correct among these 4 choices:
- ball with a mass of 5 kg
- ball with a mass of 10 kg
- ball with a mass of 15 kg
- ball with a mass of 20 kg

Could you tell me which one is correct?

ball with a mass of 20 kg