OAR Mechanical Comprehension Practice Test

To calculate the mechanical advantage of an inclined plane, you use the formula for mechanical advantage, which is the ratio of the length of the incline to the height of the incline. In this case, the length of the inclined plane is 20 feet, and the height is 5 feet.

The mechanical advantage can be calculated as follows:

Mechanical Advantage = Length of Incline / Height of Incline

Mechanical Advantage = 20 feet / 5 feet

Mechanical Advantage = 4

This indicates that for every 4 units of distance you would travel along the inclined plane, you gain a height of 1 unit. Therefore, the correct answer is that the mechanical advantage is 4, reflecting the efficiency and ease of lifting an object using an inclined plane rather than lifting it straight up.