Problem 5-22

Problem 5-22 refers you to Problem 5-20 for the rms displacement. Note that the formula in 5-20 is for v=2 and question 5-22 asks about v=0! You can derive the formula for v=0 by following 5-22, but I hadn't intended that. The formula for v=0 is the same as for v=2 except it's 1/2 instead of 5/2 as the factor.