1. The problem statement, all variables and given/known data A force stretches a wire by 2mm. A second wire of the same material and with the same area of cross-section and twice the length is also stretched by the same force. What will its stretch be? 2. Relevant equations F= (YA/L)ΔL 3. The attempt at a solution F, Y, and A are all equal First wire: F =(YA/L1)*2 mm Second wire: F =(YA/2L1)ΔL 1. I set them equal to each other to solve for ΔL (YA/2L1)ΔL = (YA/L1)*2 2. I cancelled out YA ΔL/2L1 = 2/L1 3. I multiplied both sides by 2L1 to isolate ΔL ΔL = 4 mm Did I do this correctly? I'm unsure because I've received notes from a friend and they got a different answer for the same problem. Thanks in advance.