# Physics average speed

## Homework Statement

Use the data table of displacement time data to get a line of best fit using your Ti-83 calculator. Once you have the equation, graph it so that you can answer the questions 1-5 that follow. Assume that the data below is for an object that is launched vertically upwards.

Time (sec) Displacment (m)
0 9.3
.5 15.075
1.0 18.8
1.5 20.475
2.0 20.1

Using the information above, calculate the average speed for the object from 0.75 sec to 2.9 sec.

## Homework Equations

I've tried using the distance divided by time, but that hasn't worked, so I think the equation is actually where my problem is. The one I've tried mainly is average speed=change in distance/change in time

## The Attempt at a Solution

Time Displacement
.75 17.193
2.9 14.259

AS=(14.259-17.193)/(2.9-.75)
AS= -1.36
Which isn't right.

Thanks!

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BruceW
Homework Helper
I think your calculation is correct. So maybe there is something wrong with using the calculator's line of best fit as a model for the displacement against time?

I think the calculation might be wrong since -1.36 was correct as the answer for average velocity.

Redbelly98
Staff Emeritus