Hi, Was doing some testing for work, but a lot of my physics are gone! Hope someone can help... Here goes: A rigid mass is connected to a spring and the spring to a solid anchor on the ceiling. The mass has an initial velocity vi (due to free fall of the rigid mass). I have the force-time (F-t) chart and I am trying to determine the total amount of energy absorbed (work done is more appropriate here I suppose??) by the spring. How should I do this? I was thinking of getting the area under the F-t chart and then multiply it by the average velocity. I assumed that the average velocity is (vi + vf)/2; vf is the final velocity = 0. Initially this feels right, but after some thought, the approach looks suspicious. Can I assume that average velocity = (vi + vf)/2? Any advice would be appreciated. Thanks!!