<PRE><B>Question 613886</B>
Find the time it takes for a rocket launched from a 35-foot-high platform with an initial velocity of 30 feet/sec. to reach the ground. 
Using many different methods, I came up with 2.7 seconds
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h(t) = -16t^2+30t+35
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H(t) is zero when the rocket reaches the ground.
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Solve:
-16t^2 + 30t + 35 = 0
I graphed it and found a positive solution at t = 2.7.
You are correct.
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You could use the quadratic formula and find the same positive answer.
Cheers,
Stan H.
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