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[" 4.When a block of mass "M" is suspend...

[" 4.When a block of mass "M" is suspended by a long wits "],[" oflength "L" ,the length of the wire becomes "(L+D,T" re "],[" clastic potential energy stored in the extended wire is "],[[" (a) "(1)/(2)MgL," (b) "Mgl],[" (c) "MgL," (d) "(1)/(2)Mgl]]

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