I have linked to this before, but here are some more practice questions for chapter 7
I changed the numbers a little bit:
A horizontal spring with a stiffness of 6 N/m has a relaxed length of 30 cm with an attached mass of 100 grams. The spring is stretched to 40 cm and let go. What is the kinetic energy when the mass gets back to 30 cm position?
Do you like physics? Are you looking for something a little extra? Try this physics journal club – http://globalphysicsdept.org/2014/03/17/physics-student-journal-club-prep/
It’s online and free. They meet Wednesday nights at 8:00 PM. I attend from time to time, but this one looks pretty cool.