After doing some exercises on the floor, you are lying on your back with one leg pointing straight up. If you allow your leg to fall freely until it hits the floor, what is the tangential speed of your foot just before it lands? Assume the leg can be treated as a uniform rod x = 0.79 m long that pivots freely about the hip.
here's the link to the image
The Attempt at a Solution
I have no idea what to do am i suppose to use Conservation of Energy to solve this problem or use this formula K=(1/2)mv^2[1+(I/mr^2)] I have no idea where to start.