Question 870209
A water balloon is dropped from the roof of a 60-foot building with an initial velocity of 20 feet per second. The height of the balloon can be modeled by a function. 

a.	What is the function that represents the height of the balloon at a specific time? Use h(t) to represent the function.

b.	How long does it take the balloon to reach the ground? (Round the answer to the nearest tenth of a second.)

c.	What is the balloon’s height at t = 0.5 seconds?
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Assuming the 20 ft/sec is upward (since it's positive):
a.	What is the function that represents the height of the balloon at a specific time? Use h(t) to represent the function.

{{{h(t) = -16t^2 + 20t + 60}}} (commonly used for English units, tho it's not my place to spec the function)
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b.	How long does it take the balloon to reach the ground? (Round the answer to the nearest tenth of a second.)
Solve {{{h(t) = -16t^2 + 20t + 60}}}  for h(t) = 0.  Ignore the negative solution.
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c.	What is the balloon’s height at t = 0.5 seconds?
{{{h(t) = -16t^2 + 20t + 60}}}
That would be h(0.5)