Final answer:
The weight of a 65.0 kilogram person using the acceleration due to gravity of 9.80 m/s² is 637 N, calculated with the formula W = mg.
Step-by-step explanation:
The weight of a person or object can be calculated using the formula W = mg, where W is the weight, m is the mass, and g is the acceleration due to gravity. For a 65.0 kilogram person, using g = 9.80 m/s², the calculation would be W = (65.0 kg)(9.80 m/s²) = 637 N, where N stands for newtons, the unit of force (weight). It's important to match the number of significant digits in the final answer to the least number of significant digits in the given values; in this case, there are three significant digits in both the mass and the acceleration due to gravity.