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X53
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I was in physics class a while ago and my teacher had the trajectory of a projectile on the board. he was marking off points on it, and next to each point, right after he marked it off, he wrote 1/2 next to it, then crossed it off while saying "1/2", then proceeded like that, marking off the next point, writing 1/2 next to it, and again, crossed it off and said "1/2". what in the world was he doing? i was zoned out, then when i tuned back into what was going on I saw him do this, just very briefly, as he was finishing up, then an idea came to me, then left as quickly as it came. I'm trying to get it back. I'm guessing he was doing something with the projectile equations. someone please help. thanks
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