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## Homework Statement

This is the problem:

http://i.imgur.com/OJyzfhz.png?1

## Homework Equations

$$\frac{dL}{dq_i}-\frac{d}{dt}\frac{dL}{d\dot{q_i}}=0$$

$$ L=\frac{1}{2}mv^2-U(potential energy)$$

## The Attempt at a Solution

This is my attempt at question A):

http://i.imgur.com/IeJVGm3.jpgDoes this look right? If not, am I atleast in the right direction. If I am right, how do I tackle B? I have no clue how to even begin on B.

Thanks