Two blocks with masses m$1=3\mathrm{.}0$ kg and m$2=4\mathrm{.}6$ kg are at rest on a frictionless surface with a compressed spring between them. The spring is initially compressed by $60\mathrm{.}0$ cm and has negligible mass. When both blocks are released simultaneously and the spring has dropped to the surface, m$1$ is found to have a speed of $3\mathrm{.}9$ m$/$s$.$ What is the speed of m$2?$

$2\mathrm{.}54$ m$/$s

You are correct.

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What is the spring constant of the spring?