Khan Academy: 2 D Projectile Motion: Total Final Velocity for Projectile

Explains how to calculate the total final velocity for a projectile landing at a different altitude. (There is a mistake near the end where Sal wrote 29.03 m/s when it should be 26.03 m/s, and the final total magnitude should be 26.55 m/s and 78.7 degrees below horizontal.) [7:53]