Final answer:
The acceleration due to gravity for any object, including 1 washer on the string, is always 9.8 m/s² (option a).
Step-by-step explanation:
The acceleration due to gravity for any object, including 1 washer on the string, is always 9.8 m/s² (option a). This value is obtained by multiplying the mass of the object by the gravitational acceleration constant. On Earth, the weight of a 1.0 kg object is 9.8 N. This value can vary slightly depending on the location and altitude on Earth, but for most practical purposes, it is considered to be constant.