f(t) = - 16t^2 + 90t
Maximum height occurs at
t = - b/2a
t = - 90 / 2(-16) = 2.8125
Plug t = 2.8125 in the function
f(t) = - 16(2.8125)^2 + 90(2.8125)
126.5625
Time to reach maximum height is 2.81 seconds Maximum height = 126.56 feet |
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