Problem 10.74 18 of 22 Review | Constants | Periodic Table What speed does he need at the bottom if he will coast all the way up? Consider the skateboarder as a simple particle. Express your answer with the appropriate units. A 55 kg skateboarder wants to just make it to the upper edge of a "half-pipe" with radius r of 3.0 m, as shown in (Figure 1). :8 ? vi = Value Units Submit Request Answer V Part B Figure