Answer: You are holding a briefcase by the handle, with

University Physics with Modern Physics (1) | 14th Edition | ISBN: 9780321973610 | Authors: Hugh D. Young Roger A. Freedman

ISBN: 9780321973610 228

Solution for problem Q6.15 Chapter 6

University Physics with Modern Physics (1) | 14th Edition

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University Physics with Modern Physics (1) | 14th Edition

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Problem Q6.15

You are holding a briefcase by the handle, with your arm straight down by your side. Does the force your hand exerts do work on the briefcase when (a) you walk at a constant speed down a horizontal hallway and (b) you ride an escalator from the first to second floor of a building? In both cases justify your answer.

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