How to measure potential energy of a ball?

Dean wants a quick way to look up staff members by their staff id. in cell q3, nest the existing vlookup function in an iferror function. if the vlookup function returns an error result, the text “invalid staff id” should be displayed by the formula. (hint: you can test that this formula is working by changing the value in cell q2 to 0, but remember to set the value of cell q2 back to 1036 when the testing is complete.)

What a backup plan that you have created in a event you encounter a situation

How would you categorize the software that runs on mobile devices? break down these apps into at least three basic categories and give an example of each.