If you are holding a briefcase by the handle with your arm straight down by your side, does the force of your hand exert work in the following?Does the force your hand exerts do work on the...

If you are holding a briefcase by the handle with your arm straight down by your side, does the force of your hand exert work in the following?

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?

 

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