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[" A spring when stretched by "2mm" its ...

[" A spring when stretched by "2mm" its potential energy "],[" becomes "4J" .If it is stretched by "10mm" ,its potential energy "],[" is equal to "],[[" (a) "4J," [BCECE 2003] "],[" (c) "415J," (b) "54J],[" (d) None "]]

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