Mechanical energy of the frisbee-earth system


Question: A 80 g Frisbee is thrown from a point 0.71 m above the ground with a speed of 10 m/s. When it has reached a height of 1.1 m, its speed is 8.7 m/s. What was the reduction in the mechanical energy of the Frisbee-Earth system because of air drag?

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Mechanical Engineering: Mechanical energy of the frisbee-earth system
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