SOLUTION: Here is a word problem that has been giving me some trouble. I would love some help on it. an object is dropped out of an airplane at 784 feet above the ground. the height(h) above

Question 144774: Here is a word problem that has been giving me some trouble. I would love some help on it. an object is dropped out of an airplane at 784 feet above the ground. the height(h) above the ground (t) seconds after it was dropped is given by the formula h=-16t^2+784. How long will it take the object to hit the ground? Please, this one is killing me.
Kyle
Answer by nabla(475) (Show Source): You can put this solution on YOUR website!
Solve for h=0.
0=-16t^2+784
0=t^2-49
This means t= 7 or t=-7. t=-7 does not make sense so we exclude it from the answer set.
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