a ladder 20m long rests against a vertical wall so that the foot of the ladder is 1m from the ground

2 answers

Please learn to read and follow directions.

Is the ladder suspended in space?

Do you have a question?
an unusual position -- the ladder is not on the ground.

I expect you mean the foot of the ladder is one meter from the wall. I assume you want the height of the top of the ladder. If the height up the wall is h, then

1^2 + h^2 = 20^2