Projectile Motion
(1) Introduction and Theory:
Consider a projectile motion of a ball as shown in Fig. 1. At t = 0 the ball is
released at the position (0, y
0
) with horizontal velocity
v
x
.
Figure 1. The system of coordinates for the projectile motion.
Because of the influence of a constant gravitational acceleration in the Y
direction, the x and y components of motion, according to Newton’s laws of
motion, are governed by the following equations:
x = v
x
* t
/ 1 /
y = y
0
– ½ * g * t
2
/ 2 /
where g = 9.81 m/sec
2
is the gravitational acceleration.

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