6. A 2.2 kg rock rests on the edge of a bridge that is 3.3 m above a river. What is the gravitational potential energy of the rock when measured from the surface of the
river? What is the gravitational potential energy when measured from the edge of
the bridge?

71 J

Explanation: The formula for gravitational potential energy is Epg= mgh.

So you plug in 2.2 as m, 3.3 as h and 9.81 as g. Once you do that you should get an answer of 71.2206. But because there are only two significant digits in the question, your answer must also have two significant digits.

think its the third option

the answer is 3.1 his answer is wrong mines is right