A building is under construction, and a construction worker is standing on top of a 130 m high elevator shaft. The worker accidentally drops his hammer down the shaft. a. At what speed does the hammer hit the ground? A) 25 m/s B) 40 m/s C) 50.5 m/sec D) 65 m/s b. How much time passes between when the hammer is dropped and when it hits the ground? A) 2 sec B) 3 sec C) 4 sec D) 5.15 seconds

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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A building is under construction, and a construction worker is standing on top of a 130
m high elevator shaft. The worker accidentally drops his hammer down the shaft.

a. At what speed does the hammer hit the ground?
A) 25 m/s B) 40 m/s C) 50.5 m/sec D) 65 m/s

b. How much time passes between when the hammer is dropped and when it hits the ground?
A) 2 sec B) 3 sec C) 4 sec D) 5.15 seconds

c. What fraction of the total airborne time does the hammer spend in the top 75% of the falling distance?
A) 77% B) 87% C) 97% D) 67%

PS: With diagram and full details please

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