What is the Escape Speed of an Electron from a Charged Glass Sphere?

[kmikias]

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Homework Statement

What is the escape speed (in m/s) of an electron launched from the surface of a 7.42 cm diameter glass sphere that has been charged to 7.04 nC?

Homework Equations

u=kqq/r
KE=1/2MV^2
U_O=KE

The Attempt at a Solution

here is what i did
kqq/r = 1/2mv^2
solve for v
v=\sqrt{}2kqq/rm
i used q = 7.42 square
and mass of electron = 9.11*10^-31
and r = 0.0704/2
...but still my answer is wrong

 

[collinsmark]

What is the escape speed (in m/s) of an electron launched from the surface of a 7.42 cm diameter glass sphere that has been charged to 7.04 nC?

The Attempt at a Solution

here is what i did
kqq/r = 1/2mv^2
solve for v
v=\sqrt{}2kqq/rm
i used q = 7.42 square
and mass of electron = 9.11*10^-31
and r = 0.0704/2
...but still my answer is wrong

I believe you have the value of the sphere's charge, and the diameter of the sphere interchanged.