A beam, the weight of which may be neglected, is supported by three identical springs. When a weight W is hung from the middle of the beam, the extension of each spring is x. The middle spring and the weight are removed. What is the extension when a weight of 2W is hung from the middle of the beam?
1 )
$\frac{3x}{2}$
2 )
$\frac{4x}{3}$
3 )
2x
3x
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