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Initial velocity of an object

1. Homework Statement
What was the initial velocity of an object that moved 120m in 5.60s, reaching a final velocity of 15.0m/s in that time?


2. Homework Equations
v=d/t
a=v2-v1/t2-t1



3. The Attempt at a Solution
I was wondering is there an acceleration that i'm missing here? or am i just off?
I've been using this eq. v1=v2-a(changeintime)
Someone help :(
 
was the object at rest?
 
The book's answer is 28 m/s =S
 

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