For the following simple see-saw calculate

Question

The Mechanical advantage (assum the lever is 100% efficient

Answer 1

The mechanical advantage of a lever is calculated by dividing the input arm length by the output arm length.

Let's assume the input arm length is 2 meters and the output arm length is 1 meter.

Mechanical advantage = Input arm length / Output arm length
Mechanical advantage = 2 meters / 1 meter
Mechanical advantage = 2

Therefore, the mechanical advantage of the see-saw in this case is 2.