Science12, Physics

Question 1) 2600 Seconds which is around 43.3 min

World class runners can complete 100m dash in about 10s.

It was found that the runners usually accelerate uniformly for a certain time and then run at a constant speed for the remainder of the race.

A world class runner visit your class of 16 students. You are to design a procedure that will allow you to determine the following:

1.    The approximate time the runner accelerates

2.    The actual acceleration

3.    The constant speed in the remainder of the 100m dash.

You have at your possession the following items : Stop Watches, meter sticks, chalk and a Starter’s pistol. You can use the 11 students in the class for the experiment.

1.Outline the procedure you would use and the various measurements you will take.

1. use tape measure to measure every 10m and use Tape to mark it 

-One student should stand at each section. The student on the first section should be carrying a pistol while the others a stop watch. (Where the Tape is marked)

-The student standing at the first mark should shoot the pistol while the other 15 students start their stopwatches

-The students should stop their stop watches when the runner passes the section

2. Include a labeled diagram or photo of the design

3. Outline the calculations and the analyses you will make to find the 3 required quantities.

By looking at this experiment we can see that this is based on a Time over Distance. The X-axis is the time which will be measured in seconds, and the Y-Axis will be measured in meters. This graph will have a positive slope from the intervals that will be measured by the students. 

2. In order to find the acceleration from this experiment we can use this equation. the Vf= Vi+at
3. The constant speed can be discovered by the graph, the slope will give it to you.