Answer:
A staircase, and a wheelchair ramp, and a slide.
Explanation:
A seesaw , a wheelchair ramp and a slide is an example of inclined planes
An inclined plane is a simple machine in which a sloping or tilted surface is used to lift heavy loads with less efforts. It is flat surface raised at one end .
Inclined plane, simple machine consisting of a sloping surface, used for raising heavy bodies. The force required to move an object up the incline is less than the weight being raised, discounting friction. Examples of inclined planes are ramps, sloping roads and hills, plows, chisels, hatchets, carpenter's planes, and wedges
From the definition it can be concluded that a seesaw , a wheelchair ramp and a slide is an example of inclined planes as all have a slope and have flat surface .
And a nail and a staircase are not inclined because they do not have a flat surface .
A nail have rough surface and is not even inclined hence , not an inclined plane
as we know staircase is inclined but the surface is not smooth , staircase have steps which help us to reach at a certain height , the surface is not smooth (like a ramp) hence not an inclined plane
learn more about inclined plane :
https://brainly.com/question/14983337?referrer=searchResults
#SPJ2
