- freefall has y only
- projectile motion has x component and y component and when you combine them, you have a parabola with a trajectory (path)
- for freefall..... initial velocity drops out due to NO vi so y=1/2 g t squared
- time is shared by both x and y (so x to t to y or y to t to x)
- range equation (where you start and stop at the same level but want to find the x displacement or max height)
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