Homework Help: physics

Posted by Amelia on Thursday, May 10, 2012 at 11:48am.

Mary weighs 450 N and she walks down a flight of stairs to a level 4.50 m below her starting point. What is the change in Mary's potential energy?
1 J

whats the PE formula? and setup?

physics - Elena, Thursday, May 10, 2012 at 4:46pm
ΔPE = m•g•ΔH = 450•4.5 = 2025 J

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