HP 48G Series Quick Start Manual page 104

Step 4: View the five equations in the Froisct ile Mot ion set.
All five are used interchangeably in order to solve for missing
variables (see the next example).
EGH HEEZ HES 5S OFS ¥
MAER HEED
a
R= SIN(2:88)
[ZOLN[NREARS] PIC[+STH]EXIT
Step 5: Examine the variables used by this equation set.
MARE 2 PROJECTILE MOTION 33
A: init w—position
(A) and (¥) as needed i final x-position
init y-position
ya: i 11.1
a final y-position
A: initial angle.
vA: initial velocity 1
ETEEREEEE EE ESTEEE
Now try using this equation set to answer a question or two.
Example: You estimate that an average professional goalkeepers can
punt a soccer ball a distance (R) of 65 meters downfield
at an elevation angle (6) of 50 degrees. At what velocity
(vp) do they kick it? How high is the ball halfway through
its flight? How far could they drop kick the ball if they
used the same kicking velocity, but changed the elevation
angle to 30 degrees? (Ignore the effects of drag on the
ball.)
Step 1: Start solving the problem.
=O
PROJECTILE MOTION
8-4 Special Features