A teenager on a bicycle is coasting at a speed of 3 m/s. The teenager pedals harder, the teenager pedals harder doing 130 J of work. The bicycle and teenager have a combined mass of 80kg. How fast is the bike going after the teenager finishes pedaling.

This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.