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A ball is dropped from a height of 80 m. With g = 10 m/s^2, how long does it take to land?
A4 s
B2 s
C8 s
D16 s
Answer & Solution
Correct answer: A. 4 s
80 = (1/2)(10)t^2 gives t^2 = 16, so t = 4 s.
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