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(I) A 77 kg parachutist is attached to a 6 kg parachute. She jumps from a plane flying at 140 km/h at an altitude of

(I) A 77 kg parachutist is attached to a 6 kg parachute. She jumps from a plane flying at 140 km/h at an altitude of 0.92 km and immediately opens her parachute. If it lands vertically at 7.4m/s, find the work done by the parachute on the air. The friction on the paratrooper is neglected.

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