1. The problem statement, all variables and given/known data Here's the exact problem: Young David who slew Goliath experimented with slings before tackling the giant. He found that he could revolve a sling of length 0.650 m at the rate of 5.00 rev/s. If he increased the length to 0.950 m, he could revolve the sling only 3.00 times per second. What is the speed of the stone for each rate of rotation? Then there's more but this is the only part I have trouble with 2. Relevant equations T=(2piR)/V 3. The attempt at a solution I set it up as V=(2(3.14)(.650m))/.2s I get 20.4m/s, but the webassign thing I'm doing says that's wrong. I honestly don't know what I'm doing wrong, this should be a simple plug and chug kinda problem.