Posted by Sommer on Saturday, November 19, 2011 at 11:39pm.
im guessing PE is potential energy
eqn is PE=mgh
20N is weight of cat, which is equal to Fg, which really is Fg=mg
so simply mgh=20x5=100.
The cat's kinetic energy is = .5mv(2) (the two is a superscript, meaning the v is squared)
Regardless it's velocity is = to 0 when it is sitting, right? so KE=0
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