Physics
posted by Bongo .
While driving her new Camaro at 20.0 m/s down a fourlane highway, Jessica comes up behind a slowmoving dump truck and decides to pass in the lefthand lane.
If Jessica can accelerate at a rate of 5.0 m/s^2, how long will it take for her to reach a speed of 30.0 m/s?
( I need as much detail as possible, I am completely lost please explain)

To go from 20.0 to 30.0 m/s, that is a velocity change of 10.0 m/s.
From the definition of acceleration,
a = (velocity change)/(time required)
In this case you know that a = 5.0 m/s^2, so
time = (10.0 m/s)/(5.0 m/s^2)
= 2.0 seconds