Mike has a mass of mM= 82 kg. He jumps out of a perfectly good airplane that is 2000 m above the ground. After he falls 1000 m, when his downward speed is v₁ = 64 m/s, Mike opens his parachute. The positive y-direction is downward.

Calculate the average magnitude of the upward force, Fa₁ in Newtons, of the air resistance on Mike during his initial descent.