A race car travels northward on a straight, level track at a constant speed, traveling 0.777 km in 16.6 sec. The return trip over the same track is made in 21.7 sec.
What is the average velocity of the car for the FIRST leg of the trip?
What is the average velocity of the car for the SECOND leg of the trip?
What is the average velocity of the car for the WHOLE trip?
0.777 km/16.6 sec = avg v for first leg.
0.777 km/21.7 sec = avg v for second leg.
(2*0.777/total time) = avg for round trip.