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13. if a rocks falls from a cliff, at what point are its kinetic energy and its potential energy the same? ign ore air resistance. assume the potential energy is relative to the bottom of the cliff.
a. just as it starts to fall
b. halfway down
c. just before it hits the bottom
d. n e v e r

14. which energy transformation takes place when charging the battery of a cellphone?
a. chemical to mechanical
b. electrical to chemical
c. chemical to electrical
d. electrical to light

15. according to the law of conservation of energy. which of the following is N O T true?
a. energy can't be created or d e s t r o ye d.
b. the total KE + PE of a system is always the same
c. energy can transfer from one object to another
d. energy can change forms