What Is the Force of Air Resistance and Friction Acting on a Diver?

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Homework Statement



A 57.0 kg diver dives from a height of 15.0 m. She reaches a speed of 14.0 m/s just before entering the water. What was the average force of air resistance (e.g., friction) acting on the diver?
Bonus: What is the force of friction underwater if she reaches a depth of 2.5 m before stopping? Do not neglect the buoyant force of 500 N acting on the diver once underwater

Homework Equations



Ek + Ep = Etot

The Attempt at a Solution



0.5mv^2 + mgh = ?


i don't understand how i can find air resistance, maybe I am using the wrong equation??
 
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what would be the divers speed if there was no air resistance using the fact that acceleration = g
 
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