Answer:
D. ideal mechanical advantage
Explanation:
The ideal mechanical advantage (IMA) of a machine is defined as:
[tex]IMA=\frac{d_i}{d_o}[/tex]
where
[tex]d_i[/tex] is the input distance
[tex]d_o[/tex] is the output distance
Therefore, the correct answer to the question is
D.ideal mechanical advantage
(Note that this is different from the actual mechanical advantage (AMA), which is less than the IMA, because it takes into account frictions and energy loss. In fact, the IMA represents the theoretical maximum mechanical advantage of the machine, while the AMA represents the actual mechanical advantage of the machine when frictions are taken into account.)
