Final answer:
The acceleration due to gravity is 9.8 m/s² downward, but with air resistance, exact acceleration cannot be determined without additional information.
Step-by-step explanation:
When you throw a ball upward with a speed of 14 m/s, the acceleration of the ball after it leaves your hands is 9.8 m/s² downward, assuming air resistance is negligible. If you take air resistance into account, the acceleration will still be downward but might be slightly less than 9.8 m/s² due to the opposing force of the air resistance. However, without specifics about the magnitude of air resistance, the exact value cannot be determined. Therefore, the answer to the question would be d) Cannot be determined.