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A hoverfly is happily maintaining a fixed position about 10 ft above the ground when an...

A hoverfly is happily maintaining a fixed position about 10 ft above the ground when an elephant charges out of the bush and collides with it. The fly bounces elastically off the forehead of the elephant. If the initial speed of the elephant is 20 mph, what is the speed of the fly after the collision? Hint: The mass of the fly is significantly smaller than the elephant, so that the mass of the fly is approximately 0.
Science   Advanced-Physics   
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