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A metal wire has original length 
. It is then suspended and hangs vertically as shown in the figure below.
The weight of the wire causes it to stretch. The elastic potential energy stored in the wire is 
.
Show that the SI base units of are 
.
The elastic potential energy is given by
Where:
is the density of the metal,
is the acceleration of free fall,
is the cross-sectional area of the wire and
is a constant.
Determine the SI base units of .
.
