Question

(6) what is the average speed and velocity of a sprinter when he completes the 100m dash in 12.5 seconds?

Explanation:

Step1: Recall speed formula

Speed = $\frac{distance}{time}$

Step2: Calculate average speed

Given distance = 100m, time = 12.5s. So, speed = $\frac{100}{12.5}=8$ m/s

Step3: Recall velocity concept

In a 100 - m dash (straight - line motion), displacement = distance = 100m

Step4: Calculate average velocity

Velocity = $\frac{displacement}{time}=\frac{100}{12.5}=8$ m/s

Answer:

Average speed: 8 m/s; Average velocity: 8 m/s