Using Energy and momentum conservation to derive the equation

[Jenna]

Homework Statement

I need to find the intial velocity of a ball, given the angle the pendulum bob swings through.
I need to derive this equation.
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V0=4.43mtotalL1/2{1-cosΔθ}1/2/mball

Homework Equations

The Attempt at a Solution

I have barely any attempts since I can't even think where to start. How am I supposed to derive this using kinematics??

 

[haruspex]

I need to find the intial velocity of a ball, given the angle the pendulum bob swings through.

That cannot be the whole question. Please state it exactly.

barely any attempts

Nevertheless, you need to post what you have, and any thoughts.
A free body diagram, perhaps?

Relevant equations

What standard equations do you think might be relevant?

 

[Chandra Prayaga]

A diagram is essential. Your statement of the problem is not complete. What is 4.43mTotalL, etc.? In what position does the pendulum start?

 

[lekh2003]

Try and draw a free body diagram and I'm sure there will be some kind of equation in your textbook or where you are learning this from.