An initially stationary hovercraft sits on a large lake. At time t=0 it accelerates due north at a rate of 1.2 m/s2 for 10 s, does not accelerate at all for the next 10 s, and then accelerates at a rate of 0.6 m/s2 due east for another 10 s. The hovercraft then coasts for another 10 s without any acceleration.
a. what is the velocity of the hovercraft at time t=40 s?
b. What is the displacement of the hovercraft at time t=40 s?