An Airplane Flies in a Vertical, Semicircular Arc in Order

Multiple Choice

An airplane flies in a vertical, semicircular arc in order to simulate "weightlessness" for its occupants. If the speed at which the plane flies is 750 km/hr, what is the radius of the semicircular path it flies in?

A) 57 km
B) 1.6 km
C) 4.4 km
D) 2.2 km
E) 76 km