Two identical stones, a and b, are thrown from a cliff from the same height and with the same initial speed. stone a is thrown vertically upward, and stone b is thrown vertically downward. which of the following statements best explains which stone has a larger speed just before it hits the ground, assuming no effects of air friction?
a. both stones have the same speed; they have the same change in ugand the same ki
b. a, because it travels a longer path.
c. a, because it takes a longer time interval.
d. a, because it travels a longer path and takes a longer time interval.
e. b, because no work is done against gravity.
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