Posted by **Jon** on Wednesday, December 8, 2010 at 11:15am.

Suppose all of the apples have a mass of 0.10 kg. If apple (A) is sitting on the ground, what is its potential energy?

A) 0.10 J

B) 9.8 J

C) 0.0 J

D) 1.0 J

Would it be A?

- IPC -
**Jon**, Wednesday, December 8, 2010 at 11:25am
or C?

- IPC -
**MathMate**, Wednesday, December 8, 2010 at 12:35pm
C is correct.

However, the reference of "potential energy" is not unambiguously defined. In most cases, it is taken as the ground, assuming we cannot go lower. In case we work with mines, or underground water flow, the reference point would be much lower. Given the choice, C would be logical, although anyone *could* be valid.

- IPC -
**Anonymous**, Tuesday, February 15, 2011 at 4:30pm
Suppose all of the apples have a mass of 0.10 kg and one of the apples in the bowl (C) is 1.0 meter off the ground. If the apple (C) falls from the table, what is the maximum kinetic energy it can gain?

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