An airplane moves 140 m/s as it travels around a vertical circular loop which has a 1.0-km radius. What is the magnitude of the resultant force on the 70-kg pilot of this plane at the bottom of this loop?
A)2.1 kN
B)1.4 kN
C)0.69 kN
D)1.5 kN
E)1.3 kN