Question

A runner training for a race times 400 meter laps. Lap 1 60sec, Lap 2 57sec, Lap 3 55sec, Lap 4 53sec. What is the average velocity in meters per second?

a. 0.563
b. 7.1
c. 14.2
d. 56.25

please help me, I using the average velocity formula but still i get it wrong

Answer 1

You do NOT average the velocities of each lap, although that will be close to the right answer.

The correct answer is

1600 meters (the total distance) divided by total time, in seconds (60 + 57 + 55 + 53 = 225 s).
1600/225 = ___ m/s