Net WPM is a better formula than Gross WPM to calculate typing speed because it includes .

If you typed 200 characters in 30 seconds your net speed would be (200/5) / 0.5 = 80 WPM. A Net WPM calculation is preferred for measuring typing speed as opposed to the Gross WPM computation since including mistakes will give a more complete picture of your true typing abilities.

Explanation:

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only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.