Which of these is an example of no work being done?   a. a child pushes a toy car across a flat table   b. a ball is dropped from a height of 1.00 m to the floor   c. a car has the force of its brakes applied to the left while moving to the right   d. a weightlifter holds 500 pounds above his head and does not move   e. all of these

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter9: Energy In Nonisolated Systems
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Which of these is an example of no work being done?
  a.
a child pushes a toy car across a flat table
  b.
a ball is dropped from a height of 1.00 m to the floor
  c.
a car has the force of its brakes applied to the left while moving to the right
  d.
a weightlifter holds 500 pounds above his head and does not move
  e.
all of these
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