Answer the following question given this paragraph: 

Consider the simple ramp in Figure below . A ramp can be used to raise an object up off the ground. The input distance is the length of the sloped surface of the ramp. The output distance is the height of the ramp, or the vertical distance the object is raised. Therefore, the ideal mechanical advantage of the ramp is:.


Q: The length of the sloped surface of a ramp is referred to as what?

 Choices:

- accumulation distance

- output distance

- furlong

- input distance

A:
input distance
