Starting from rest, a 1.9 × 10-4-kg fl ea springs straight upward. While the fl ea is pushing off from the ground, the ground exerts an average upward force of 0.38 N on it. This force does + 2.4 × 10-4 J of work on the fl ea.
(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.