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Q. A parachutist of mass 50-kg jumps out of an airplane at a height of 1.000 m. The parachute deploys, and she lands on the ground with the speed of 5.0 m/s. How much energy was lost to air friction all through this jump?

Q. A small rocket is powered upward on lift-off by an engine thrust of 12,000-N. If the resulting upward acceleration is 6.40m/s^2, what is the mass of the rocket?

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