A block fall from a table $0\mathrm{.}75$ m high. It lands on a vertical string with a force constant of $\backslash (2000\backslash$mathrm$\{$~N$\}/\backslash$mathrm$\{$m$\}\backslash ).$ The spring initially is $0\mathrm{.}3$ m high and after the impact is compressed to a minimum height of $0\mathrm{.}1$ m from the ground. Use $\backslash (\backslash$mathrm$\{$g$\}=10\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}^\{2\}\backslash ).$ Find the mass of the block

Hint: What is the initial height of the mass? What is the final height of the mass? What is the compression of the spring?

$8\mathrm{.}5$ kg

$6\mathrm{.}2$ kg

$4$ kgh

$3\mathrm{.}3$ kg