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?
whats the PE formula? and setup?
physics - Elena, Thursday, May 10, 2012 at 4:46pm
ΔPE = m•g•ΔH = 450•4.5 = 2025 J