A boat ended up with a velocity of 30m/s [N30E] after it experienced an acceleration of 30m/s^2[w] for a period of 4.0s. What displacement did the boat cover?

s = vt + 1/2 at^2 = (15i+15√3 j)4 + 1/2 (-30i)4^2

= -180i + 60√3 j