1. The problem statement, all variables and given/known data A girl with a mass of 40 kg is swinging from a rope with a length of 2.8 m. What is the frequency of her swinging? 2. Relevant equations I could find the period of the situation and then from there could calculate the frequency. For the period I'm not sure what equation I should use. I tried using the equation T=2∏ (√I / mgh ). This did not work for me though. Any help would be nice! 3. The attempt at a solution Attempt shown above.