Impulse

A 0.40 kg toy car is acted on by a horizontal force that varies with time. The force increases linearly from 0 N at $t = 0$ to 6.0 N at $t = 2.0\,\text{s}$, then immediately drops to zero and stays zero. The car is initially at rest. What is the speed of the car at $t = 2.0\,\text{s}$?