SOLUTION: A stone is thrown upwards, the distance travelled is given by s = 1 + 4t � 8t� then the distance travelled by the stone is ?

Question 962236: A stone is thrown upwards, the distance travelled is given by s = 1 + 4t � 8t� then the distance travelled by the stone is ?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A stone is thrown upwards, the distance travelled is given by s = 1 + 4t � 8t� then the distance travelled by the stone is ?
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Find the highest point and the time to get there.
It's the vertex of the parabola, at t = -b/2a
t = -4/-16 = 1/4 second
s(1/4) = 1 + 1 - 1/2 = 1.5 units (feet?)
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Had it started at ground level, the distance up would equal the distance falling, but it was 1 ft AGL, so 1 had to be subtracted.
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Distance = 2*1.5 - 1 = 2 feet
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