While standing at the top of the stairs, you have a potential energy of 40 Joules. If you walk all the way down the stairs, what would your potential energy be at the bottom of the stairs?
A. 40 Joules
B. 0 Joules
C. 80 Joules
D. 20 Joules
Answer: B
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____________________. Fill in the blank(s) with the appropriate word(s).