4. Bob tosses a pen straight up into the air, but does not catch it, so it falls to the floor. The speed of the pen is 3.7 m/s when it leaves his hands, and his hands are 1.2 m above the floor. a) What is the sign of the pen's velocity on the way up? What about the sign of its acceleration on the way up? b) How long was the pen in the air? ...at the top? ...at the top? way down? ...on the ...on the way down?

College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter2: Kinematics
Section: Chapter Questions
Problem 54PE: A ball is thrown straight up. It passes a 2.00-m-high window 7.50 m off the ground on its path up...
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4. Bob tosses a pen straight up into the air, but does not catch it, so it falls to the floor. The speed of the
pen is 3.7 m/s when it leaves his hands, and his hands are 1.2 m above the floor.
a) What is the sign of the pen's velocity on the way up?
What about the sign of its acceleration on the way up?
b) How long was the pen in the air?
c) What is the pen's velocity just before it hits the floor?
...at the top?
...at the top?
...on the way down?
...on the way down?
Transcribed Image Text:4. Bob tosses a pen straight up into the air, but does not catch it, so it falls to the floor. The speed of the pen is 3.7 m/s when it leaves his hands, and his hands are 1.2 m above the floor. a) What is the sign of the pen's velocity on the way up? What about the sign of its acceleration on the way up? b) How long was the pen in the air? c) What is the pen's velocity just before it hits the floor? ...at the top? ...at the top? ...on the way down? ...on the way down?
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