03-03-2016
Mathematics

Answered

If a stone with an original velocity of 0 is falling from a ledge and takes 8 seconds to hit the ground, what is the final velocity of the stone? A. 39.2 m/s B. 42.6 m/s C. 78.4 m/s D. 156.8 m/s

Verified Answer :

Anonymous Anonymous

14-03-2016

Getting the final velocity of a free fall, we need to use this formula:
vf = g t
where
g = 9.8 m/s^2
t = time

From the problem given, the final velocity of the stone is
vf = g t
vf = 9.8 m/s^2 * 8 s
vf = 78.4 m/s

So the correct answer is letter C. 78.4 m/s

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smpurvis smpurvis

03-12-2018

your answer is C. 78.4 m/s

i just took the test

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