Texas Instruments TITANIUM TI-89 - Manual (Page 94)

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Parametric Graphing Parametric Graphing Parametric Graphing Parametric Graphing
Graph the parametric equations describing the path of a ball kicked at an angle (q) of 60¡
with an initial velocity (v
0
) of 15 meters/sec. The gravity constant g = 9.8 meters/sec
2
.
Ignoring air resistance and other drag forces, what is the maximum height of the ball and
when does it hit the ground?
Steps and keystrokes Display
1. Display the MODE dialog box. For Graph
mode, select PARAMETRIC .
Press 3 B 2 ¸
2. Display and clear the Y= Editor . Then
define the horizontal component
xt1(t) = v
0
t cos q.
Enter values for v
0
and q.
Press 8 # , 8 ¸ ¸ 15T p
2 X 60 2 “ d ¸
Type T
p 2 X, not T 2 X.
Enter a ¡ symbol by typing either 2 “
or
2 I 2 1. This ensures a number
is interpreted as degrees, regardless of
the angle mode.
xt1(t)=15t … cos(60 ¡ )