Calculating Escape Velocity of the Moon

[ASidd]

Homework Statement

The gravitational acceleration of the moon is 1.6 m/s^-2. Estimate its escape velocity and explain how you did this?

Homework Equations

v= square roots(2GM/r)

The Attempt at a Solution

I have absolutely no idea how to do this question at all

 

[AJ Bentley]

Weren't you given the radius of the moon too?