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**[SOLVED] [101]Potential energy of mass on a spring with 2 givens**

**1. Homework Statement**

A 1.1 kg mass vibrating up and down on the end of a vertical spring has a maximum speed of 3 m/s. What is the total potential energy of the mass on the spring when the mass is at either endpoint of its motion? NOTE: Assume that the potential energy of the mass on the vertical spring is zero when the mass is at the midpoint of its motion.

**2. Homework Equations**

ME=KE+PE?

PE(tot)=PE(g)+PE(e)?

**3. The Attempt at a Solution**

I am having a hard time figuring out how to attack this one... I have a graph of energy of a simple harmonic motion, which I understand. It makes sense to me that KE will be greatest and PE will be zero at its midpoint, and vice versa at the uppermost and lowermost part of its the motion. But without the spring constant or its length of travel, I cant get any further.

Can someone "light bulb" me?=P

Thank you so much for your help!