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Word and Energy

A student lifts a book of mass 1.12 kg to a height of 1.24 m; use g=9.8 m/s^2, write an equation then calculate:
a) How much work does the student do?

b) What is the potential energy of the book?

c) If the student drops the book vertically, what is the book's kinetic energy when it reaches the floor?

d) What is the speed of the book when it reaches the floor?

Solution Preview

(a) Work = Weight*Height = Mass*gravity*height = 1.12*9.8*1.24 = 13.61024 J
(b) ...