1. Determine the potential energy of a 2kg rock at the top of a hill that is 20m high. 2. Determine the kinetic energy of a 2000 kg roller coaster car that is moving with a speed of 25 m/s.

3. A 80kg freezer is located in an office on the 59 floor of an office building 200 meters above the ground. What is the potential energy of the freezer?

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Explanation:

1. The potential energy of an object is given by . Substituting given values, we have:

2. The kinetic energy of an object is given by . Substituting given values, we have:

3. 1. The potential energy of an object is given by . Substituting given values, we have:

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.