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View the five equations in the Projectile Motion set. All five are
Step 4:
used interchangeably in order to solve for missing variables (see
the next example).
Step 5:
Examine the variables used by the equation set.
and — as ˜ needed
Now use this equation set to answer the questions in the following
Example: You estimate that on average professional goalkeepers can
punt a soccer ball a distance (R) of 65 meters downfield at an
elevation angle (
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.
Enter the known values and press the soft menu key
Step 2:
corresponding to the variable. (You can assume that x
are zero.) Notice that the menu labels turn black as you store
values. (You will need to press L to see the variables that are
initially shown.)
) of 50 degrees. At what velocity (v
) do they
and y
Page 19-2


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