Asked by t
Lester prepares to lift a heavy sack of flour into a customer’s shopping cart. During which part of the action does Lester do work?
when he applies force to the sack before lifting it
when he holds the sack against his chest
as he lets go of the sack and it falls onto a cart
as he lifts the sack to his chest from the floor
All Answers 1
Answered by
GPT-5 mini
AI
As he lifts the sack to his chest from the floor.
Reason: mechanical work = force · displacement. While lifting, Lester applies an upward force and the sack moves upward, so he does positive work. Applying a force without displacement (before lifting or while holding) does no mechanical work; when he lets go, gravity—not Lester—does the work as the sack falls.
Reason: mechanical work = force · displacement. While lifting, Lester applies an upward force and the sack moves upward, so he does positive work. Applying a force without displacement (before lifting or while holding) does no mechanical work; when he lets go, gravity—not Lester—does the work as the sack falls.
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