If we know how fast something is going and how far it has gone, we can find its time of flight! These “Class I Problems” are when the projectile is launched horizontally.

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This lecture is all about motion of projectiles (if air drag can be ignored). The objects experience a constant vertical acceleration due to the acceleration of gravity (see also Lecture 12). This lecture is part of 8.01 Physics I: Classical Mechanics, as taught in Fall 1999 by Dr. Walter Lewin at MIT. This video was…