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Velocity of the ring wraiths relative to the air:
The speed is what we want to find - this is the speed at which the wraiths are flying in the air.
(Note: denotes velocity, while
denotes speed)
Velocity of air relative to the ground:
The ring wraiths want their trajectory to be due north, which means their velocity relative to the ground should be
To an observer on the ground, is the speed at which the wraiths would appear to be moving in the air.
The relative velocities satisify