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a) What's the tension on the rope on the top point of the circle?

b) What's the tension on the rope on the bottom point of the circle?

Here's my attempt to solve these.

a) Fc = mv^2/r Fg= mg Ft= the force applied on the rope

Fc=Ft + Fg

Ft=Fc - Fg

Ft=mv^2/r - mg

Ft=2*4^2/1 - 2*9,8

Ft=12,4 N

b)

Fc=Ft - Fg

Ft=Fc + Fg

Ft=mv^2/r + mg

Ft=2*4^2/1 + 2*9,8

Ft=51,6 N

Can anyone please verify that this is correct?