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Homework Statement
A physics book weighing 20 N is dropped from a position 2.0 meters above the floor. a) what is the potential energy of the book before it is dropped? b) what is the kinetic energy of the book when it is 1.0 meter from the floorHomework Equations
Ek = 1/2mv^2 , Ep= mghThe Attempt at a Solution
a) Ep = mgh = 20N X 2.0 = 40NB) I don't know what to do ):