Projectile Motion

Author:
ksherida
Topic:
Parabola
Move point A to change where the projectile land. Slide "t" to see where the projectile would be at any point in time. Slide "angle" to see how the initial angle affects the projectile's motion.
At what angle is the projectile's motion most efficient? In what parts of the projectile's motion is vertical velocity positive? negative? What effect does the angle have on the initial velocity needed to reach point A?