~~A helicopter lifts a 72kg astronaut 15m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. How much work is done on the astronaut by a) the force from the helicopter, and b) the gravitational force on him? c) what are the kinetic energy, and d) the speed of the astronaut just before he reaches the helicopter?
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Answer:
1. 11.664 J
2. -10584.4 J
3. 1058 J
4. 5.4 m/s
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