I’m not entirely certain, but usually, spring symbolizes rebirth.
1/f= 1/di+1/do
1/f=1/90m+1/40m
1/f ≈27.7m
ur answer is A or also known as
When you push a child on a swing, you are doing work on the child because you are pushing against the force of gravity
hope this helps :)
The last one.
One grey sphere, Four white spheres, and One red spheres
