Two spheres falling through water..terminal velocity?

[imatreyu]

Homework Statement

A glass sphere of diameter 1.75 cm and density 2.5 g/cm^3 falls through water with a terminal velocity of 0.3m/s. A wooden sphere of the same diameter and density 0.85 g/cm^3 is released from the bottom of a tank of water. Determine the terminal velocity with which the wooden sphere rises.

Homework Equations

I have no idea where to start! Could someone point me in the right direction?

The Attempt at a Solution

I converted everything so that all units are in kg or m . . .

But now I have no idea what equation to use, etc. . . Just a hint. . would be nice.

Thank you, in advance!

 

[rajatgl16]

answer is 3cm/s upward direction

 

[imatreyu]

Oh. . .Wow, thank you.