Question

A car accelerates from 0-26.8m/s in 2.2s. What is its average acceleration?

Answer 1

Average acceleration = 12m/s^2

Step-by-step explanation:

Acceleration is equal to the change in velocity over the change in time:

`a=(\Delta v)/(\Delta t)`

Change in velocity is the final velocity minus the initial.

We are told the car goes from 0 to 26.8 m/s making 26.8 our final and 1 our initial. Therefore the change in velocity is 26.8-0 = 26.8m/s. (
`\Delta v`)

And that this happens over 2.2s so this is our change in time:
`\Delta t`

Therefore our acceleration is:
`a = (26.8)/(2.2)`

Acceleration = 12.18 m/s^2

Rounded to 2 significant figures (2s.g. in 2.2s), the answer is 12m/s^2.

Hope this helped!