Exercise 2.48 A large boulder is ejected vertically upward from a volcano with a
ID: 1644196 • Letter: E
Question
Exercise 2.48
A large boulder is ejected vertically upward from a volcano with an initial speed of 40.5 m/s . Air resistance may be ignored.
Part A
At what time after being ejected is the boulder moving at a speed 20.5 m/s upward?
2.04
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Correct
Part B
At what time is it moving at a speed 20.5 m/s downward?
6.22
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Correct
Part C
When is the displacement of the boulder from its initial position zero?
8.27
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Correct
Part D
When is the velocity of the boulder zero?
4.13
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Correct
Part E
What is the magnitude of the acceleration while the boulder is moving?
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Part F
What is the direction of the acceleration while the boulder is moving?
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Exercise 2.48
A large boulder is ejected vertically upward from a volcano with an initial speed of 40.5 m/s . Air resistance may be ignored.
Part A
At what time after being ejected is the boulder moving at a speed 20.5 m/s upward?
t =2.04
sSubmitMy AnswersGive Up
Correct
Part B
At what time is it moving at a speed 20.5 m/s downward?
t =6.22
sSubmitMy AnswersGive Up
Correct
Part C
When is the displacement of the boulder from its initial position zero?
t =8.27
sSubmitMy AnswersGive Up
Correct
Part D
When is the velocity of the boulder zero?
t =4.13
sSubmitMy AnswersGive Up
Correct
Part E
What is the magnitude of the acceleration while the boulder is moving?
a = m/s2SubmitMy AnswersGive Up
Part F
What is the direction of the acceleration while the boulder is moving?
up downSubmitMy AnswersGive Up
Explanation / Answer
Part E: Magnitude of acceleration=9.81 m/s2
Part F :The direction of the acceleration while the boulder is moving is always down
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