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A small object is dropped from the top o...

A small object is dropped from the top of a building and- falls to the ground. As it falls, accelerating due to gravity, it passes window. It has speed `v_(1)` at the top of the window and speed `v_(2)` at the bottom of the window, at what point does it have speed `(v_(1)+v_(2))/2` ? Neglect the air resistance.

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