Late night sanity check (Average Acceleration)

[DrummingAtom]

Homework Statement

A car's velocity as a function of time is given by v_x(t) = a + bt², where a=3.00m/s and b=0.100m/s³. Calculate the average acceleration from interval t=0 to t=5.00s.

Homework Equations

Ave Acceleration = v₂-v₁/t₂-t₁

The Attempt at a Solution

After plugging in the numbers it's:

(3+0.1t²)/5-0 =

1.1m/s

Which after 2 attempts online it's wrong. I even tried it with 1.10 to see if it picks up sig figs, but it's still wrong. Does it have something to do with m/s³?

Thanks.

 

[DrummingAtom]

Wow, that's embarrassing. After reading it over, I just realized that I was neglecting the v₁ because it was at 0. Even though the "a" still have a value. Ahhh, got to love the late nights.