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PLEASE HELP!! I'm stuck on this

PLEASE HELP!! I m stuck on this class=

Verified Answer :

MathisLif3

t=0=>initial
s (0)=4.5=9/2
=>s(t)=-16t^2+64+9/2
use s(-b/2a) to find height
it will take -b/2a seconds to reach that height
n I tell a,b coefficients of some
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