I wrote it in MIT's 8.01[OCW - Physics] subject, but seems that there are not much movement..
At the end of lecture 12, Prof. Walter Lewin asks if the time for an object that is launched from ground zero with an angle != 0 to reach the maximun altitude (point P) is the same as it to land from there to y=0. Considering air drag.
Shall we discuss it?

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At the highest point of altitude what is your velocity?

Velocity in the y direction that is

and think about what variable are in air drag

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