I had a problem on my physics test today that said something like. You have a string with radius of 25 or 50 cm (cant remember which) and you have a mass hung on the end of the string. And the intial velocity is zero when the string is horizontal. The question was what is the velocity at the bottom of its circular path. How can you solve this? I was stumped, it was a multiple choice question and the answers were approximate numbers ranging from 2 m/s to 6 m/s. I just do not see how you could solve this problem without knowing the mass, and getting an approximate number. Also it did not say that the strings mass was neglible. Any clues?