4.5 Exercise 29

A spaceship is traveling at a constant velocity of $\overset{\rightarrow}{v} \left(t\right) = 250.0 \hat{i} \text{m} / \text{s}$ when its rockets fire, giving it an acceleration of $\overset{\rightarrow}{a} \left(t\right) = \left(3.0 \hat{i} + 4.0 \hat{k}\right) \text{m} / \text{s}^{2} .$ What is its velocity $5$ s after the rockets fire?