A rock is thrown downward from the top of a 40.0 m tower with an initial speed of 12 m/s. Assuming negligible air resistance, what is the speed of the rock just before hitting the ground? a) 28 m/s b) 784 m/s c) 56 m/s d) More information is needed. e) 30 m   (

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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A rock is thrown downward from the top of a 40.0 m tower with an initial speed of 12
m/s. Assuming negligible air resistance, what is the speed of the rock just before hitting the ground?
a) 28 m/s
b) 784 m/s
c) 56 m/s
d) More information is needed.
e) 30 m
 
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