If gravity is the only force present, what is the total mechanical energy of a box falling of a truck at a time when it's potential energy is 100J and it's kinetic energy is 150J?
physical science - Damon, Saturday, June 18, 2011 at 6:32pm
250 , just add
physical science - drwls, Saturday, June 18, 2011 at 7:01pm
Be aware that the value of potential energy depends upon the location where you define it to be zero. That location is arbitrary.
Damon's answer is correct; I just object to the wording of the question.