A man pushes an 80-N crate up a frictionless slope that makes an angle of 30° with the horizontal. The man was able to push it to a distance of 5.0m along the slope with a force parallel also to the slope. However the speed of the crate decreases at a rate of 1.5 m/s?. The work being done by the man is: A. -200 J B. 61 J C. 140J D. 200 J

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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9.
A man pushes an 80-N crate up a frictionless slope that makes an
angle of 30° with the horizontal. The man was able to push it to a
distance of 5.0Om along the slope with a force parallel also to the
slope. However the speed of the crate decreases at a rate of 1.5 m/s?.
The work being done by the man is:
A. -200 J
В. 61J
С. 140 J
D. 200 J
14.
A 6.0-kg block is released from rest 80 m above the ground. When it
has fallen 60 m its kinetic energy is approximately:
A. 4800 J
В. 3500J
C. 1200 J
D. 120 J
Transcribed Image Text:9. A man pushes an 80-N crate up a frictionless slope that makes an angle of 30° with the horizontal. The man was able to push it to a distance of 5.0Om along the slope with a force parallel also to the slope. However the speed of the crate decreases at a rate of 1.5 m/s?. The work being done by the man is: A. -200 J В. 61J С. 140 J D. 200 J 14. A 6.0-kg block is released from rest 80 m above the ground. When it has fallen 60 m its kinetic energy is approximately: A. 4800 J В. 3500J C. 1200 J D. 120 J
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