An object with mass 8 kg moves from a location (22, 23, −41)m near the Earth's surface to location (−27, 11, 40)m.?
What is the change in the potential energy of the system consisting of the object plus the Earth? (Assume that the +y axis points vertically up from the ground.)
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Change in height = 11m - 23m = -12m
Change in potential energy = mg*(change in height) = 8*9.8*(-12)
= -940.8 joules