acceleration

[espo]

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

[Integral]

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]

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. [:(]