## Conceptual Physics (12th Edition)

At the top of your jump, your acceleration is $10 \frac{m}{s^{2}}$, directed downward. This is discussed on pages 64-65. At the top, you are at rest and there is no air resistance. The force on you is mg and this is the only force, thus it's the net force. By Newton’s Second Law, the acceleration $a = mg/m = g$.