solved thanks to dicerandom... i forgot that vf is squared in the second formula. thanks so much(adsbygoogle = window.adsbygoogle || []).push({});

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

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!

# Homework Help: Please help with spring problem

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