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...

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Problem with a spring

**Physics Forums | Science Articles, Homework Help, Discussion**