A squirrel in a tree drops an acorn.
How long does it take the acorn to fall 20 feet?
Using the model d(t) = 16t2 , solve the equation d(t) = 20. 16t2 = 20
t2 = _5 4 t = ±??_5 4 t = ±?_ ??5 2
Reject the negative value of t. The acorn falls 20 feet in _ ??5 2 ? 1.1 seconds.
Mathematics
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