How Do Electron and Positron Speeds Relate to Their Charge and Separation?

[nns91]

Homework Statement

An electron (charge -e, mass m) and a positron (charge +e, mass m) revolve around their common center of mass under the influence of their attractive coulomb force. Find the speed of each particle v in terms of e, m, k and their separation r ?

Homework Equations

F= kq1q2/ r^2

The Attempt at a Solution

Can you guys give me a hint on this one ? Should I find the angular speed then ?

 

[tiny-tim]

Hi nns91!

Hint: use centripetal acceleration