A 0.5 kg object is at the top of a water well and then dropped into the bottom of the well, the well depth is 4 m. What is the gravitational potential energy in joule of the object after it reaches the bottom of the well? (Take g = 10 m/s2). Answer:

The lowest point in Death Valley is 85 m m below sea level. The summit of nearby Mt. Whitney has an elevation of 4420 m m above sea level. What is the change in potential energy of an energetic 68 kg k g hiker who makes it from the floor of Death Valley to the top of Mt. Whitney?

A 4.0 kg object is raised 7 meters above the ground (on the earth).  How high would the object have to be raised above the surface of the moon (g = 1.6 N/kg) to have the same amount of potential energy.  Use gEhE=gMhM

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