1. The problem statement, all variables and given/known data The bob of a pendulum 1.2m long is pulled aside so the string is 40 degrees from the vertical. When the bob is released, with what speed will it pass through the bottom of its path? 2. Relevant equations PE=mgh KE=(mv^2)/2 3. The attempt at a solution Well, I started out with cos 40=x/1.2 and found x to be approximately .92, but I don't exactly know where to go from there.