A light spring of length \( l \) and rigidity \( k \) is placed vertically on a table. A small b...

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A light spring of length \( l \) and rigidity \( k \) is placed vertically on a table. A small ball of mass \( m \) falls on it.
Determine the height \( h \) from the surface of the table at which the ball will have the maximum velocity.
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