Question 51
FA student uses the ruler-drop test to measure her reaction time.
The Figure shows how the test is set up.
Figure
The student does the test four times. The Table shows her results.
Table
| Trial | Distance the ruler falls in cm\text{cm}cm |
|---|---|
| 1 | 17 |
| 2 | 20 |
| 3 | 14 |
| 4 | 19 |
a.[3]
Describe how the student should use the apparatus to obtain an accurate value for the distance the ruler falls.
b.[2]
Calculate the mean distance the ruler falls.
c.[2]
Explain why the reaction time of the student when she is driving a car is likely to be longer than the reaction time measured by the ruler-drop test.