In Order to Simulate Weightlessness for Astronauts in Training, They

Multiple Choice

In order to simulate weightlessness for astronauts in training, they are flown in a vertical circle. If the passengers are to experience weightlessness, how fast should an airplane be moving at the top
Of a vertical circle with a radius of 2.5 km?

A) 510 m/s
B) 160 m/s
C) 310 m/s
D) 260 m/s
E) 79 m/s