1. The problem statement, all variables and given/known data t=2π (square root m/k). Find the value of 'k'. 2. The attempt at a solution t2= 4π^2m/k k=4π^2m/ t^2 When data is inputted, 'k' should equal 141, but when I do it, the number varies and is significantly greater than 141, but starts with those 3 figures. Is it something wrong with the equation or error actually calculating? My other question is converting s=ut + ½at^2 to y=mx so that I can find out 'a'. I made it so s/t=u+at with s/t equalling 'y', 'a' equalling 'm' and 'x' equalling 't', but the gradient of the graph is about half (not exactly though) what it should be. It should equal 9.81 or whatever gravity's acceleration is, but it equals 4.9532. Have I done the wrong graph then?