Starting from rest, a $2\mathrm{.}0$x$10-4$ kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of $0\mathrm{.}47$ N on it$.$ This force does $3\mathrm{.}3$x$10\text{'}*$ J of work on the flea. $($a$)$ What is the flea's speed when it leaves the ground? $($b$)$ How far upward does the flea move while it is pushing off? Ignore both air resistance and the flea's weight.