A block attached with a spring is kept on a smooth horizontal surface. Now the free end of the s...

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A block attached with a spring is kept on a smooth horizontal surface. Now the free end of the spring is pulled with a constant velocity \( u \) horizontally. Then the maximum energy stored in the spring and block system during subsequent motion is
(1) \( (1 / 2) m u^{2} \)
(2) \( m u^{2} \)
(3) \( 2 m u^{2} \)
(4) \( 4 m u^{2} \)
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