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Posted by on Saturday, June 18, 2011 at 6:14pm.

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 - , Saturday, June 18, 2011 at 6:32pm

    250 , just add

  • physical science - , 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.

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