Question

6. A 2.2 kg rock rests on the edge of a bridge that is 3.3 m above a river. What is the

Answer 1

Answer: 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.