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 Depdendent Variable

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 Dependent Variable

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# Math 1101 Project

Background

For this project, you will use the function

s(t) = at2 + bt + c .

s is the height (in feet) of an object propelled directly upward after t seconds.

In physics, the coefficient b is usually written as v0 v and represents the initial velocity (feet per
second) of the object. Initial velocity is the velocity at time t = 0 . For instance, if a ball is
thrown up, it will have a positive initial velocity. If a ball is dropped, the initial velocity is zero.

The constant c is normally written as s0 s and represents the initial height or distance above the
ground of the object. Initial height is the height at time t = 0 . If a missile is shot off from the
ground, then s0 = 0 . If however, it is shot off from the top of a 100-foot building, then s0 =100 .

Collecting Data (Monday, April 14 to Thursday, April 24 - no exceptions)
You will collect your CBL ball toss data in my office. You will toss a ball up in the air and the
CBL motion detector will record the height of the ball. At least one member of your group must
come to my office (during office hours or by appointment) to do the ball toss. I prefer that both
members come to collect the data. You do not need to bring anything except your TI-83/84
calculator. Group members will share the same data. I will keep a copy of your data.

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The CBL program records time data (in seconds) and the height of the ball above the ground (in
feet). You will use this data to find a quadratic model for your ball toss.

I will write a calculator program that will save your data and put it in L1 and L2. To execute this
program, hit the "PRGM" key. Select the program name. Hit "ENTER". Your time data will be
in L1 and your height data will be in L2

This assignment must be typed up and pictures of your calculator screen must be inserted in
appropriate spots in your report. I should not have to “assemble” the report for you. Your work
should be organized and easy to follow. Your papers must be stapled together.

1. Turn on one of the STATPLOTs. Check that L1 and L2 are listed. Plot the data with dots,
not squares.

2. Since there are 80 data points, we will let the calculator set the window. The
STATPLOT must be turned on. Hit the "ZOOM" key. Select "9: ZoomStat". Edit the
window so that you can see the x-axis. Include this STATPLOT in your report with a
description.

3. Does the plot of your ball toss data open upward or downward? Is the vertex a maximum
or minimum point? Will the coefficient a be positive or negative?

4. Find the vertex graphically (TRACE) or numerically (L1 and L2). In complete sentences,
explain what the x-coordinate of the vertex represents and what the y-coordinate of the
vertex represents. Be sure to include units.

5. Write the function for the height in the form s(t) = a(t − h)2 + k . Save this equation until
we find a.

data. Graph this quadratic function with the STATPLOT of the data. Include this picture
in your report with a description and the regression equation. Explain why this quadratic
does not fit the ball toss data very well.

7. Now we will edit the data. We only want the data points that look like they are on a
parabola.
- Hit 2nd , LIST (on STAT key).
- Move the cursor to "OPS".
- Select "8: Select".
- You are now on the home screen. After the "Select ( " , type in "L1, L2)".
- You are now on the graph screen. To answer the "Left Bound?", move the cursor to the
first point that looks like it is on the parabola. Hit "ENTER".
- To answer the "Right Bound?", move the cursor to the last point that looks like it is on
the parabola. Hit "ENTER".

Voila! Your data has been edited. If you made a mistake and want to start over, run the
data program that I wrote for you. Include the coordinates of the first and last data points
and a picture of the edited ball toss data (with a description) in your report.

edited ball toss data. Graph this quadratic function with the STATPLOT of the edited
data. Include this picture in your report with a description and the regression equation..

9. Use the equation from part 8 to answer the following:

a) Does your initial velocity and initial height seem reasonable? Explain.
b) When does the ball hit the ground?
c) When is the ball 4 feet above the ground?
d) Find the interval of time when the ball is more than 4 feet above the ground.

Note: If your ball is never 4 feet above the ground, use 3 feet in 9c and 9d.

10. Now take the a from the equation in part 8, and plug it into the vertex form equation in
part 5. Graph the vertex form equation with the STATPLOT of your edited ball toss
data. How good is the fit? Include this picture in your report with a description and the
vertex form equation.