A suitcase is hanging straight down from your hand as you ride an escalator. Your hand exerts an upward force on the suitcase, and this force does work. This work is... O Negative when you ride up and positive when you ride down. O Negative when you ride either up or down. O Positive when you ride either up or down O Positive when you ride up and negative when you ride down.
A suitcase is hanging straight down from your hand as you ride an escalator. Your hand exerts an upward force on the suitcase, and this force does work. This work is... O Negative when you ride up and positive when you ride down. O Negative when you ride either up or down. O Positive when you ride either up or down O Positive when you ride up and negative when you ride down.
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