posted by Rachel .
A truck is stopped at a stoplight. When the light turns green, the truck accelerates at 2.2 m/s2. At the same instant, a car passes the truck going 12 m/s. Where and when does the truck catch up with the car?
They go the same distance in the same time.
truck: d=1/2 a t^2
set the distances equal
12t=1/2 a t^2