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A skydiver opens the parachute at the moment when he is 540 meters above the ground...

A skydiver opens the parachute at the moment when he is 540 meters above the ground and his speed (right before opening the parachute) is 97m/s. What should be the magnitude of the air resistance force for the skydiver to come to a stop exactly at the ground? The mass of the diver including the parachute is 82kg. Assume g=9.8m/s2 ,please include free-body diagram

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