try google first
I saw several discussions of problems just like yours.
What is the escape speed of an electron launched from the surface of a 1.5 cm diameter glass sphere that has been charged to 10 nC?
Which equation(s) would I use?
4 answers
I have tried and I did not find anything.
I guess more people are asking the same question right now, because early, there was nothing.
You must not have tried too hard, because I got several hits, such as
https://answers.yahoo.com/question/index?qid=20070429182156AAn5Pem
which is the exact same problem, but with different numbers.
https://answers.yahoo.com/question/index?qid=20070429182156AAn5Pem
which is the exact same problem, but with different numbers.