(Original post by nerd434)
AB is measured using a metre stick.
A trolley is timed between AB.
The following results were obtained - AB = (60+- 0.1)cm
Times (Seconds) - 1.21, 1.21, 1.26, 1.27, 1.24 and 1.28
Express the average speed in the form: Value +- Absolute Uncertainty
Well, what are you stuck on?
First, get an average value for the time taken, and the associated uncertainty (random uncertainty).
Once you have the value for the average time taken (and uncertainty), you can calculate the average speed as the measured distance over the average time taken. The corresponding uncertainty will be given by the formula:
where S is the average speed, D is the measured distance, T is the average time, and ΔS, ΔD, ΔT are the absolute uncertainties in those quantities, respectively.
Remember that the units for the speed will be carried over from the distance and time measurements (speed will be in cm/s).