Question

greg is in a bike race. at mile marker four (out of ten), his speed was measured at 13.5 mph. which best describes the measured number? it is the average speed of the bike rider. it is the instantaneous speed of the bike rider. it is the instantaneous velocity of the bike rider. it is the average velocity of the bike rider.

Explanation:

Average speed/velocity is calculated over an interval, while instantaneous speed/velocity is at a specific point. Here, the speed is measured at a particular mile - marker (a specific point), and speed only has magnitude (no direction mentioned, so not velocity). So it's the instantaneous speed.

Answer:

It is the instantaneous speed of the bike rider.