Imagine I throw a ball straight upwards with some velocity v1, and filming the ball with a camera, I can estimate a velocity v2 (along the same vector) after the ball has moved a distance D. Using the difference between v1 and v2, and assuming constant friction due to air, how well can I estimate the initial velocity necessary to toss the ball some height H?
For fun - provided some v1, v2, and D, can we estimate an upper-bound for the Earth escape velocity with air friction/drag? Or is there unpredictable scaling of friction with velocity?
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