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Physics Gravitation Level: High School

You are on an airplane traveling with a constant velocity at an altitude of 20000 m . What is the acceleration of gravity at that altitude ? The radius of Earth is 6.37 x 10 to power of (6) m .

a) 9.81 m/s squared .

b) 9.78 m/s squared .

c) 9.75 m/s squared .

d) 9.72 m/s squared .