1. Here is the equation http://i.imgur.com/EKdWnws.png
2. The attempt at a solution
The first part I've done correctly. So here's my thought process:
To get the period I used T=2 * pi * sqrt(r3 /GM_E)
T=5521s
W(angular velocity)=2pi/T
W=1.138*10-3 rad/s
V=WR where r is 6754000m...