Look at the attached picture. I DO realize that this has been brought up several times, but there's a thing i still don't understand.(adsbygoogle = window.adsbygoogle || []).push({});

As you can see, I have solved the problem already but that was not without using several hints. Going through each hint at a time i solved the problem using conservation of energy after the collision. But but but! I don't agree with the energy assumptions they made. They made me use the elastical potentiel energy relative to the new equilibrium point as well as the kinetic energy and equaled that ½kA^2 where A denotes the amplitude.

BUT WHAT ABOUT THE LOSS IN POTENTIAL ENERGY DURING THE DOWNFALL? This depends on A as far as i can see making you need to solve a quadratic equation..

Anyways I got the right as you can see, but I don't get it...

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# Homework Help: Problem with a spring

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