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Old Oct 24th 2017, 05:18 PM   #1
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Mass Between 2 Different Springs

I've attached a photo of the question. I got a), but I think I did b) and c) wrong. All this is supposed to be solved using the Law of Conservation of Energy, no "frequency" or anything... Thanks for any help or point in direction!!
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Mass Between 2 Different Springs-wechat-image_20171024191323.jpg  
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Old Oct 25th 2017, 07:09 AM   #2
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I find the wording of (a) a little confusing! The work done by force, F, in moving the block from the initial equilibrium point to the new position is, of course, the integral of F dx. But then the words "the block is held at rest" are added. The work done in holding something at rest against any force is 0.

As far as (b) is concerned, the force necessary to move the block becomes its total energy which, as long as the "block is held at rest", is all potential energy. When the block moves back to it initial equilibrium point, all that potential energy becomes kinetic energy.
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