A clarinetist, setting out for a performance, grabs his $3\mathrm{.}250$ kg clarinet case $($including the clarinet$)$ from the top of the piano and carries it through the air with an upward force of $33\mathrm{.}48$ N $.$

Use $g=9\mathrm{.}810\frac{m}{s^2}$ for the acceleration due to gravity.

Find the case's vertical acceleration $a.$

Let up define the positive direction.

$a=$

$\frac{m}{s^2}$