Final answer:
The person's current speed remains 3 m/s as they experience no force or acceleration, consistent with Newton's first law of motion.
Step-by-step explanation:
If a person is moving at a rate of 3 m/s and experiences no force and no acceleration, their current speed remains unchanged at 3 m/s. In physics, this is a direct application of Newton's first law of motion, often referred to as the law of inertia, which states that an object in motion will stay in motion with the same speed and direction unless acted upon by an unbalanced external force. Since there is no acceleration, we can conclude that the speed of the person does not increase or decrease; Hence, the correct answer is Option 2: 3 m/s.