Problem 52.

(Inquiry into Physics-5th ed.,Ostdiek,Bord) A runner has an average speed of 4 m/s during a race. How far does the runner travel in 20 minutes?

Solution:

By definition the traveled distance is equal to the product of traveled time and the average velocity. In this problem we need to convert time into seconds: 20 minutes = 20*60 seconds = 1200 seconds. Then