A 70.5 kilogram skydiver is falling toward the Earth at a constant speed. What is the approximate magnitude of the upward force of air resistance acting on the skydiver?

Answer 1

If they are traveling at constant speed, then they must not be accelerating. This means that the force of air resistance must be equal and opposite to the force of gravity pulling the sky diver down:

F = mg

Assume g = 9.8 m/s^2

F = 70.5 x 9.8 = 690.9 N

Approximate force of air resistance = 690.9 N