Posted by **Priscilla** on Monday, January 4, 2010 at 4:38pm.

A 2.0-kg rock falls from a height of 25 m to a point 20 m above the ground.

How much potential energy does it lose?

GIVEN:

mg = 2.0 kg

h/d = 5 m

PE = mgh

PE = (2)(5)

PE = 10 J

- Physics -
**bobpursley**, Monday, January 4, 2010 at 4:51pm
NO. PE=mgh

you did not include the value of g.

- Physics -
**Priscilla**, Monday, January 4, 2010 at 5:36pm
OK, i was told by my teacher that mg would equal together 2 kg. If your including g then:

PE = mgh

PE = (2)(9.8)(5)

PE = 98 J

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