Classic problem

Classical Mechanics Level 4

A block of mass $m$ is dropped from a height $h$ on a spring, of constant $k$ , as shown in the figure. Find the maximum velocity attained by block

Details and Assumption

Assume spring is long enough.
Spring is fixed on ground at one end.
$h=\SI{5}{\meter}, m=\SI{6}{\kilo\gram}, g=\SI{10}{\meter\per\second\squared}, k=\SI{2}{\newton\per\meter}$