A car starts at rest and accelerates in 4 seconds to a speed of 20 m/s, which it maintains for the next 8 seconds. Find the total distance travelled.
d= vi*t +1/2 at^2
d= Vavg*t = Vf+Vi/2 *t
The Attempt at a Solution
The total time is 12seconds right?
I can't figure this one out...please help?