# Using Conservation of Energy

1. Oct 8, 2009

### tutojean

1. The problem statement, all variables and given/known data

Example: A 50 kg gymnast does giant circles around a horizontal bar. At the top of her swing her center of mass is 1.0 m above the bar travelling 1.2 m/s. what is the speed of her center of mass at the bottom of her swing where her center at mass is 1.0 m below the bar? ( No given diagram)

2. Relevant equations
[K + Eg + Es] = [K + Eg + Es + Ef]
Initial Final

K=1/2mv^2
Eg=mgh
Es= 1/2 kx^2
Ef= uND

3. The attempt at a solution
What I did: [K] = [K + Eg]
or either [ Eg] = [K}. Please help me with setting this problem up. The first set up didn't work for me and I'm just needing help setting the problem up. No need for figuring out the problem. Thank You

2. Oct 8, 2009

### rock.freak667

If we take the bar she is swinging from as having 0 potential and kinetic energy, that the top of her swing, what types of energy does he have and what the total energy she has due to these two types?