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hey
how did u get the .5 dRock??
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Do you mean this?
Drock = 0.5aTrock^2
= 0.5*9.81*Trock^2
It's an equation for distance travelled.
d = vt + (1/2)at^2
In this case, though, your starting velocity (v) is 0, since you're dropping it, not throwing it. 0*t will equal zero, so you can forget about that part.
The 9.81 comes from acceleration due to gravity.
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