Question

What is his speed between 12 and 20 seconds of his journey?

Answer 1

= 0.25m/s

Explanation:

The formula of finding the speed, v is given by

`v \: = (change \: in \: distance \: d)/(change \: in \: time \: t)`

The change in distance from the graph is

∆d = (8 - 6)

= 2 m

The change in time from the graph is

∆d = (20 - 12)

= 8s

Substituting to our formula, we have

`v \: = (2m)/(8s) \\ = (1)/(4) (m)/(s) \\ = 0.25 {m}s^( -1 )`

Therefore, the speed v, of the journey between 12 and 20 second is 0.25m/s.