Calculating the Velocity at the bottom of a Pendulums Trajectory.

[R3id]

Homework Statement

I am trying to calculate the velocity of the pendulum at the bottom of the trajectory.
Mass of the ball - 2.0 kg
Height - .2 m
G - 9.8 m/s^2

Homework Equations

PE = mgh
He mentioned something about the tangential force, I'm really not sure what I should be doing.

The Attempt at a Solution

 

[tannerbk]

You should be using conservation of energy. Your gravitational potential will be entirely kinetic energy at the bottom of the trajectory.