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A block of mass is placed on a duster to wipe a board. In doing so, the duster is compressed by . Does the elastic energy of the duster increase or decrease due to the block on top of it and by how much?
A block on top of a duster on a board
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The elastic energy of the duster increases by .
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is placed on a duster to wipe a board. In doing so, the duster is compressed by 
. Does the elastic energy of the duster increase or decrease due to the block on top of it and by how much?
.
