A uniform chain of length 3 meter and mass 3 kg overhangs a smooth table with 2 meter laying on the table. If k is the kinetic energy of the chain in joule as it completely slips off the table, then the value of $k$ is $\_\_\_\_$ (Take $\mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )