Speed of a pendulum at its lowest point

[Runaway]

Homework Statement

Homework Equations

F_g= M * g
g=-9.8m/s²
Sine=Opp/Hyp
Cos=Adj/Hyp
Tan=Opp/Adj

The Attempt at a Solution

I used the concept of a unit circle to find $$\Delta$$Y
(Sine(270 + 19)* 2 meters) + 2 meters= 0.109 meters
but I am unsure of what to do now. I thought that the answer to part 2 would be zero, because at point P it is no longer accelerating due to gravity but it says that's not the answer.

 

[Integral]

What do you know about the potential energy of the ball?

 

[Runaway]

it's zero at point P and at its maximum at points Q and Q', and at points Q and Q' it is equal to .109m * 9.8m/s² * its mass = 10.682 s^-2 * m