1. The problem statement, all variables and given/known data A 5 kg block is attached to the end of a spring with relaxed length 0.5 m and spring constant 250 N/m. The free end of the spring is held stationary and the block is made to go in a circle of radius 0.75 m, thus stretching the spring. What is the speed of the block (neglecting gravity and air resistance)? 2. Relevant equations Fspring=k|s| F*[tex]\Delta[/tex]t= m*v p=Fnet*[tex]\Delta[/tex]t 3. The attempt at a solution F=k|s| F=250 (.5-.75) F=-1000 F=mv? I don't know what to do from here... this is on a practice exam, so I have the answer: 3.1 m/s, but I have no idea how to get to it. I tried F=mv, but got v to be 2.0, which isn't even an option. Please help!