- #1

- 36

- 0

## Homework Statement

http://i.imgur.com/BV5gR8q.png

## Homework Equations

d/dx ∂F/∂y

^{'}=∂F/∂y

## The Attempt at a Solution

I have no problem with the first bit, but the second bit is where I get stuck. Since the question says the speed is proportional to distance, I have taken v(x)=cx where c is some constant of proportionality, then tried to proceed with solving the EL equation, however I end up with everything just being equal to 0 so I'm not sure how to proceed.

http://i.imgur.com/hDNPyG7.jpg