Projectile motion
A projectile is an object moving through the air under the influence of gravity alone, like a ball rolled off a table. Its horizontal and vertical motions are independent of each other. Ignoring air resistance, the horizontal velocity stays constant, because no horizontal force acts, while the vertical velocity changes steadily because gravity accelerates the object downward at about 9.8 m/s^2. So a ball rolled off a table and a ball dropped from the same height hit the floor at the same time. For a horizontal launch, the fall time comes from the height (height = 1/2 x g x time^2), and the horizontal distance is horizontal speed x time: a ball leaving a 4.9 m ledge at 3 m/s falls for 1 second and lands 3 meters out.
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