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Answer :
Answer:109
Step-by-step explanation:
h(t) = -16t^2 + 80t + 9.
compare with equation ax%5E2%2Bbx%2Bc=0
a=-16, b=80 c =9
time to go to height h = -b%2F2a
=(80/32)= 2.5 s
time to go maximum height is t = = = = 2.5 seconds.
The maximum height you can get by substituting this value t= 3.5 in the formula
h(t) = -16t^2 + 80t + 9
h(2.5) = -16*2.5^2 + 80*2.5 + 9.
h =109m
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