Can you solve for tension using these formulas?

[electronicxco]

A 2.91 kg object is swung in a vertical circular
path on a string 3.94 m long.
The acceleration of gravity is 9.8 m/s2 .
If the speed at the top of the circle is 7 m/s,
what is the tension in the string when the
object is at the top of the circle?

can you show the formulas needed to get to the answer? Thanks a lot

 

[ideasrule]

Here they are:

F=ma
Fc=mv^2/r
Fg=mg