Chapter 4, Problem 6CQ

A projectile is launched from a level surface with an initial velocity of $\stackrel{\to }{v}=\left(\text{2 m/s}\right)\stackrel{⌢}{\text{x}}\text{ + }\left(\text{4 m/s}\right)\stackrel{⌢}{\text{y}}$. What is the velocity of the projectile just before it lands? Explain.