Each bus takes the same amount of time to stop. Which school bus needs a larger force to come to a stop?

 - a school bus carrying 800 pounds
 - a school bus carrying 600 pounds
Look for the school bus that is heavier.
A school bus carrying 800 pounds is heavier than a school bus carrying 600 pounds. So, the school bus carrying 800 pounds needs a larger force to come to a stop in the same amount of time as the other bus.