As I was lifeguarding a pool I work in, a group of kids kept playing with a football. The way they through it made a perfect projectile motion in which we studied. One kid threw the football in the positive direction and the ball decreased in speed as it got higher until it reached its peak (pictured below) then as it made its descent the ball increased in speed as it got to the other boys hand. Acceleration stayed constant (-9.8m/s/s).
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