To calculate the mechanical advantage (MA) of the lever, you can use the formula:
\[ \text{mechanical advantage (MA)} = \frac{\text{output force}}{\text{input force}} \]
In your case:
- The output force (force applied to the load) is 180 N.
- The input force (force you apply to the lever) is 40.0 N.
Now, substitute the values into the formula:
\[ \text{MA} = \frac{180 , \text{N}}{40.0 , \text{N}} = 4.5 \]
Therefore, the mechanical advantage of the lever is 4.5.