Harry Potter is sitting 2.0 meters from the center of a merry-go-round when Draco Malfoy casts a spell that glues
Harry in place and then makes the merry-go-round start spinning on its axis. Harry has a mass of 50.0 kg and can
withstand 5:0 g's of acceleration before passing out. What is the magnitude of Harry's angular momentum when
he passes out?
The Attempt at a Solution
Assuming that the spell is a force then rF = I alpha. And using alpha = a/r, we using the max acceleration of 5g that
5mgr = Ia/r
However I'm not sure where to go from this, how do i get v? as time is unknwon