How Do You Calculate Uncertainties in Velocity Measurements?

[DrDanger]

Homework Statement

A glider moves on a level (horizontal) air track. The motion detector records five velocities of the glider: 0.48 m/s, 0.48 m/s, 0.53 m/s, 0.48 m/s, 0.47 m/s. The average velocity, uncertainty in the velocity, and relative uncertainty are

Homework Equations

Avg velocity= V1+V2+V3+V4+V5/2

The Attempt at a Solution

For the average velocity I used the above equation and got 0.488. For the uncertainty in the velocity I did 0.53-0.47/2 to get plus or minus 3, but I'm not sure if that is right. I have no idea on how find the relative uncertainty

 

[DrDanger]

Ok so I just read that relative uncertainty is found by percent uncertainty in velocity/ avg value. Correct? but when I use that my answer is'nt one of my choices. So is there something wrong I did when finding the percent uncertainty in the velocity?