We calculate the initial projectile speed o , and associated uncertainties by using the results from Appendix A and substituting in the values. The calculation to determine o is slightly more complicated and we refer to Eqs. (5) and (6) of the Error Analysis Reference handout to perform the error propagation in our o value. The calculation for o' the initial projectile speed, is shown below for a projectile gun with a launch angle of 0 (0 ), a height of 0.83 meters, and using 9=9.8m.s-2 1.24948m (0) i2 9.8m . 52x i V = VI To determine the uncertainty of this value, we must find the deviations due to the uncertainties in our angle, A0 and range, Ar: 1.24948m (9) 9.8m . s-2 x i Av =Vi 1.24948+0.00139 m (0) 12 9.8m .5- 2x i Av = Vi