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September 20, 2014

September 20, 2014

Posted by **Lilly** on Monday, March 19, 2012 at 4:14am.

(a) Taking y = 0 at the top edge of the well, what is the gravitational potential energy of the stone–Earth system before the stone is released?

(b) Taking y = 0 at the top edge of the well, what is the gravitational potential energy of the stone–Earth system when it reaches the bottom of the well?

(c) What is the change in gravitational potential energy of the system from release to reaching the bottom of the well?

- Physics -
**Elena**, Monday, March 19, 2012 at 2:09pmPE1 = 0

PE2 = -mgh = - 0.31•9.8•1.2 = - 3.65 J.

ΔPE = 3.65 J.

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