Near the surface of the earth if air resistance is negligible, the x and y components of position, velocity, and acceleration of a projectile are independent. Therefore, you can consider a projectile thrown at some angle as having the motion of two similar projectiles, one that travels upward with a constant downward acceleration and one that travels horizontally at constant velocity.
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| Ball thrown at an
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Physlet created by Aaron Titus, North Carolina A and T.