SOLUTION: What is the speed of a 2.5-kilogram mass after it has fallen freely from rest through a distance of 12 meters? 4.8 m/s 15 m/s 30. m/s 43 m/s

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Question 227698: What is the speed of a 2.5-kilogram mass after it has fallen freely from rest through a distance of 12 meters?
4.8 m/s
15 m/s
30. m/s
43 m/s
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
the magnitude of the mass has no effect (remember Galileo!!...)

time = velocity / acceleration

distance = 1/2 * acceleration * (time)^2

substituting ___ distance = 1/2 * (velocity)^2 / acceleration

sqrt(2 * acceleration * distance) = velocity

sqrt(2 * 9.8 * 12) = v ___ 15 = v