Khan/khan-exercises — pull request #45972 by ifingerson (2013-05-18 22:34:01+00:00)
Title: projectile motion exercises

I'm hoping to still add more projectile motion exercises, I just want some feedback on the new one, Solving for time in air. I'm thinking the hints probably need a lot of work, and I'm not quite sure how to embed a video in a subhint. @Christi, can you help with the hints?