1. The problem statement, all variables and given/known data A mass of 1.0kg is attached to a spring obeying Hooke's Law F = k.s, where F is the force applied and s the spring extension. The spring constant, k is 50 N/m. The spring and the object lie on a surface tilted 45 degrees with respect to the vertical Neglect friction and answer the following questions: a. What is the extension of the spring? b. What is the work done by gravity in extending the spring by the above extension? 2. Relevant equations F = k.s W = f.d 3. The attempt at a solution a) 1kg = 9.8N (force) Then resolve force into vert and horiz components= Tan45 x 9.8 = 9.8 (as tan45 is 1). Rearrange F = k.s into F/k = s 9.8/50 = 0.196m = s b) Work done by gravity: 9.8N x 0.196 = 1.92 Joules Does anyone know if this is right? Thanks!