SOLUTION: carol tosses an apple from a balcony to her friend standing on the ground below. the formula h=-16t squared +72t+40 gives the height, h, og the apple in feet t seconds after being

Question 1060741: carol tosses an apple from a balcony to her friend standing on the ground below. the formula h=-16t squared +72t+40 gives the height, h, og the apple in feet t seconds after being tossed. when will the apple hit the ground? (hint height of the apple when it hits the ground will be 0)
Found 2 solutions by ikleyn, Alan3354:
Answer by ikleyn(52794) (Show Source): You can put this solution on YOUR website!
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carol tosses an apple from a balcony to her friend standing on the ground below. the formula h=-16t squared +72t+40 gives the height,
h, of the apple in feet t seconds after being tossed. when will the apple hit the ground? (hint height of the apple when it hits the ground will be 0)
~~~~~~~~~~~~~~~~~~~~~~~~~~~

t is the positive root of this equation = 0. Solve by any way you know (use quadratic formula, for example) to get the answer: t = = 0.5 second.

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
carol tosses an apple from a balcony to her friend standing on the ground below. the formula h=-16t squared +72t+40 gives the height, h, og the apple in feet t seconds after being tossed. when will the apple hit the ground?
----
h(t) = -16t^2 +72t+40
The 72t indicates she threw the apple upward at 72 ft/sec.
--> 5 seconds to impact.
================
If you use
h(t) = -16t^2 -72t + 40 (throwing it downward)
Then it takes 1/2 second to impact, and hits her friend at 88 ft/sec (60 mi/hr)
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