Chapter 4, Problem 28A

Calculate your average speed if you run 50 meters in 10 seconds.

$\text{Distance}=\text{average speed}\times \text{time}$

To determine

The average speed for a given distance and time of travel.

Answer to Problem 28A

The average speed is $\text{5 m/s}$

Explanation of Solution

Given:

A person traveling a distance of 50 m in 10 s.

Formula used:

The distance travelled by an object moving with an average speed for a given time is expressed as,

  $\text{Distance }=\text{Average speed }\times \text{time }$

From this, the average speed can be calculated as,

  $\text{Average speed}=\frac{\text{Distance}}{\text{time}}$

Calculation Here, the the distance travelled is 50 m and time is 10 s. Thus, the average speed is given by,

  $\begin{array}{c}\text{Speed}=\frac{50}{10}\\ =5\text{ m/s}\end{array}$

Conclusion :

The average speed for a given distance and time is $\text{5 m/s}$ .