# What is the average acceleration of a car

#### espo

what is the average acceleration of a car that goes from rest to 59 km h in 9.0 seconds?

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#### Integral

Staff Emeritus
Gold Member
acceleration is definined to be change in velocity per unit time.

What is your change in velocity?

What is your change in time?

Can you take it from there?

#### lavalamp

First convert 59 Km/h into m/s:

59 * 1000 / 3600 (seconds in an hour) (m in a Km)

59 / 3.6 = 16.4 m/s

Then use the constant acceleration formula:

v = u + at
16.4 = 0 + a*9.0
a = 16.4/9.0
a = 1.82 m/s2

#### russ_watters

Mentor
Generally, lavalamp, we lead them in the right direction and then let them figure it out from there. Thats the way their teachers would want it.

#### lavalamp

Oops, I'll try and remember that in future.

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