Speed Measurement in a Bike Race

What was Greg's speed at mile marker four in the bike race?

Choose the option that best describes the measured number:

A) It is the average speed of the bike rider.
B) It is the instantaneous speed of the bike rider.
C) It is the instantaneous velocity of the bike rider.

Answer:

It is the instantaneous speed of the bike rider.

When Greg was at mile marker four in the bike race, his speed was measured at 13.5 mph. This measurement indicates his instantaneous speed at that specific point in time.

Instantaneous speed is the rate at which an object is moving at a particular moment in time. In this case, Greg's instantaneous speed was 13.5 mph at mile marker four out of ten.

It is important to differentiate between average speed and instantaneous speed. Average speed is calculated over a longer period of time, taking into account the total distance and total time, while instantaneous speed refers to the speed at a precise moment.