Respuesta :
change in velocity = 20 - 0 = 20
change in time = 2 seconds
Divide the change in velocity over the change in time: 20/2 = 10
The average acceleration is 10 m/s^2
I.e, each second, the speed increases by 10 m/s
Runner's average acceleration was 10 m / s²
The average acceleration refers to how fast the runner is going in relation to time.
It is calculated by the formula:
= Change in speed / Time
Change in distance here is:
= 20 m/s - 0 m/s
= 20 m/s
The acceleration is therefore:
= 20 / 2
= 10 m/s²
In conclusion, the runner was accelerating at a rate of 10 m/s².
Find out more at https://brainly.com/question/10712715.