A block of mass $0\mathrm{.}5$ kg is hanging on the end of a spring that is attached to a ceiling. The spring has a spring constant of $12\mathrm{.}5$ N$/$m$.$ The block is then pulled $0\mathrm{.}3$m below its static equilibrium position and released from rest.

 $($a$)$ How long will it take for the block to have an downward acceleration that is $1/3$ of its maximum acceleration, $$

$($b$)$ What is the velocity of the block at that time, and $$

$($c$)$ Where is the block at that time?