The acceleration due to gravity for any object, including 1 washer on the string, is always assumed to be m/s2

The value of acceleration due to gravity on all objects near the surface of earth will be 9.8 m/s/s or 10 m/s/s(approx)

Explanation:

here we know that all objects near the surface of earth will experience the force of gravity towards the center of earth.

this force of gravity is given as

now to find the acceleration due to this force we can say

here we will have

so acceleration due to gravity for all objects near the earth surface is nearly same or constant

ill do it for 100, also this isnt 80 its 40

less than one you can't create energy