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Q. An 90-kg skydiver jumps out of a balloon at an altitude of 1 420 m and opens the parachute at an altitude of 195 m.

Assuming that the total retarding force on the diver is constant at 55.0 N with the parachute closed and constant at 3600 N with the parachute open, what is speed of the diver while he lands on the ground?

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