This physics video tutorial on projectile motion explains how to calculate the angle at which a projectile launched from the ground will have a maximum range using calculus.

Kinematics In One Dimension: https://www.youtube.com/watch?v=dHjWVlfNraM

Free Fall Physics Problems:
https://www.youtube.com/watch?v=BVgemK1Y2wA

2-Stage Rocket Problem:
https://www.youtube.com/watch?v=EAQDQbeCTdk

Terminal Velocity:
https://www.youtube.com/watch?v=DxnDkDwK3JA

Motion Time Graphs:
https://www.youtube.com/watch?v=nUb7xfkc0Ac

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Vectors - Basic Introduction:
https://www.youtube.com/watch?v=EwSHKuSxX_8

Resultant Force - Two Vectors:
https://www.youtube.com/watch?v=RxV06Oj5sMc

Projectile Motion Problems:
https://www.youtube.com/watch?v=tfItlGfPHyo

Relative Velocity:
https://www.youtube.com/watch?v=_39hCnqbNXM

Newton's Law of Motion:
https://www.youtube.com/watch?v=g550H4e5FCY

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