When people walk, run, or travel in a car, their speed will change. They may speed up, slow down or pause for traffic. The speed at which a person can walk, run or cycle depends on many factors including:
Some typical values for speed in metres per second (m/s) include:
|Method of travel||Typical speed (m/s)|
It is not only moving objects whose speed can vary. The speed of the wind and the speed of sound also vary. A typical value for the speed of sound in air is about 330 m/s.
The distance travelled by an object moving at constant speed can be calculated using the equation:
distance travelled = speed × time
This is when:
A car travels 500 m in 50 s, then 1,500 m in 75 s. Calculate its average speed for the whole journey.
First calculate total distance travelled (s):
500 + 1,500 = 2,000 m
Then calculate total time taken (t):
50 + 75 = 125 s
Then rearrange to find v: