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1irishman
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Homework Statement
An object is dropped from a height of 25m above the ground. What is the average velocity of the object as it falls to the ground?
Homework Equations
d=vit+1/2at^2
The Attempt at a Solution
d=-25
a=-9.8
vi=0
-25=-4.9t^2
t=2.3s
vavg=displacement/time
-25/2.3=-10.8m/s
the answer in book says a=-11.1m/s i don't understand, please help?