(a) If your speedometer has an uncertainty of 2.0 km/h at a speed of 90 km/h, what is the percent uncertainty? (b) If it has the same percent uncertainty when it reads 60 km/ h, what is the range of speeds you could be going?
a) The percent uncertainty is computed as
b) The tolerance of the velocity is
Therefore, the range of the velocity is 60±1km/h, or that is 59 to 61 km/h.