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Rocket Man has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At

"Rocket Man" has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At a height of 12.6 m, his speed is 5 m/s. His mass, including the propulsion unit, has the approximately constant value of 120.1 kg. Find the work done by the force generated by the propulsion unit.

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