SOLUTION: Set up equation for problem and solve 1) An object is thrown up in the air at a velocity of 20 ft/sec. The height of the object t seconds after it is thrown is given by the fun

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Question 393274: Set up equation for problem and solve
1) An object is thrown up in the air at a velocity of 20 ft/sec. The height of the object t seconds after it is thrown is given by the function h(t)= -16t^(2)+20t . How long will it take for the object to hit the ground?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
An object is thrown up in the air at a velocity of 20 ft/sec. The height of the object t seconds after it is thrown is given by the function h(t)= -16t^(2)+20t . How long will it take for the object to hit the ground?
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Height is zero when the object hits the ground.
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Solve:
-16t^2+20t = 0
-4t(4t-5) = 0
Positive solution:
t = 5/4 = 1 1/4 seconds
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Cheers,
Stan H.