Kinematics: Find Displacement in 2x Time w/ Constant Acceleration

[joaolucas]

Homework Statement

A particle has initial velocity and constant acceleration. If its velocity after certain time is v then what will its displacement be in twice of that time?

Homework Equations

The Attempt at a Solution

Im thinking about using one of the classic kinematics equations, however i don't have the value of the initial velocity. So I am stuck in this problem. If someone could explain to me how i find this velocity, i would be grateful.

 

[dauto]

You're expected to find a solution as an algebraic expression in terms of the mentioned initial velocity, final velocity, and acceleration.