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
average velocity= totaldistance/total time
To find the average velocity, we need to divide the total distance covered by the total time taken.
The runner completed four laps, and each lap is 400 meters long. So, the total distance covered is 4 laps x 400 meters = 1600 meters.
To find the total time taken, we add up the times for each lap: 60 seconds + 57 seconds + 55 seconds + 53 seconds = 225 seconds.
Now, we can calculate the average velocity:
Average Velocity = Total Distance / Total Time
= 1600 meters / 225 seconds
= 7.1 meters per second
Therefore, the correct answer is b. 7.1.