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I'm thinking the answer is Vf or t but I'm not sure..

Rewrite    Vf = Vi+a delta t    by plugging in 
2 delta d / Vi+Vf    For    Delta t.
when you do so you will get the equation in the question below:
So tell me, Vf^2=Vi^2+2ad is independent of what variable?
(1) Vf
(2) v
(3) t
(4) a
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1 Answer

The kinematic equation
vf2 = vi2 + 2ad
does not depend on time t.  Answer (3) is correct.