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22-02-2024
Physics

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Mary weighs 490.0 N. She walks down a flight of stairs to a level 5.65 m below her starting point. What is the change in Mary's potential energy? Assume that air resistance is negligible.
a) -490.0 J
b) +490.0 J
c) -2778.5 J
d) +2778.5 J

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