SOLUTION: A plant falls from a window ledge 3.5 m above the sidewalk. How fast is the plant moving when it hits the sidewalk? a. -7.3 m/s c. -22.0 m/s b. -2.2 m/s d. -8.3 m/s

Algebra ->  Test -> SOLUTION: A plant falls from a window ledge 3.5 m above the sidewalk. How fast is the plant moving when it hits the sidewalk? a. -7.3 m/s c. -22.0 m/s b. -2.2 m/s d. -8.3 m/s       Log On


   

Question 770602: A plant falls from a window ledge 3.5 m above the sidewalk. How fast is the plant moving when it hits the sidewalk?
a.
-7.3 m/s
c.
-22.0 m/s
b.
-2.2 m/s
d.
-8.3 m/s
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A plant falls from a window ledge 3.5 m above the sidewalk. How fast is the plant moving when it hits the sidewalk?
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Find the time falling.
s+=+at%5E2%2F2
3.5+=+9.8%2At%5E2%2F2+=+4.9t%5E2
t+=+sqrt%283.5%2F4.9%29
t = 0.845157 seconds
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v = at = 9.8 m/sec/sec * 0.845157 seconds
v =~ 8.2825 m/sec