Thread: Equation re-arrangement View Single Post
 P: 25 Hi newbie question, I'm trying to work through an example of a equation where circular motion can be expressed . I'm having difficultly understanding where the next line in the equation comes from. I have shown them below. My goal is to express 'V' although currently i am a few steps away from this. Line 1 mgr + 0.5m(2$\sqrt{}rg$)2 = 0.5mv2 Line 2 gr + (2$\sqrt{}rg$)2 / 2 = 0.5v2 I can follow the equation such that i understand both 0.5m cancels out from both sides but i get lost when i try to figure out how i lose the m from the mgr expression in line 1 from line 2?