Question 896850: an apple falls from a tree. It hits the ground at a speed of about 5 m/s what is approximate height of the tree? Why?
A) 1.2 b) 2.5 c) 2.4 Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! an apple falls from a tree. It hits the ground at a speed of about 5 m/s what is approximate height of the tree? Why?
A) 1.2 b) 2.5 c) 2.4
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9.8 m/sec/sec is commonly used as the rate for gravitational acceleration on Earth. Sometimes 10 is used.
No units are given for the choices. I'll assume they're meters, tho I should not have to make any assumptions.
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v = a*t (velocity = acceleration * time)
5 = a*t
5 = 9.8t
t = 5/9.8 =~ 0.51 seconds falling
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s = at^2/2 = 9.8*(5/9.8)^2/2 = 4.9*t^2
s =~ 1.2755 meters
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A very poorly stated problem.
