vfy is negative if we say that positive y is up.
so I combined a = -vfy and vfy = b-gt -> a = gt - b
gt - b = 4.5/t
4.5 = gt^2 - bt
add to 2nd equation listed : 5.5 = gt^2 - 4.905 t^2
t = 1.06 s
Is that right?
Then by equation 1:
a = 4.25 m/s
By equation 3:
b = 6.15 m/s
and vo = 26.2 m/s...
Oh yes, I forgot to write that one.
vfy = b-gt
I am still stuck though trying to solve these equations (despite having so many!) Do you mind showing me how to do the algebra?
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