Final answer:
The incorrect use of a hand tool is II only, using a level to hammer a nail. A spade and a vise are being used correctly in examples I and III. The posthole digger is a combination of levers and wedges as simple machines.
Step-by-step explanation:
You asked which examples describe the incorrect use of a hand tool. The correct response to this question is: II only, which is using a level to hammer a nail. This is incorrect because a level is designed to check whether a surface is horizontal or vertical, and using it to hammer could damage the tool and will not effectively drive the nail in. A spade is indeed used to dig small holes, which is its correct usage, and a vise is correctly used to hold something in place.
Regarding the posthole digger mentioned, this device combines two types of simple machines: the lever and the wedge. To find the ideal mechanical advantage (IMA) of the levers, you would divide the length of the lever arm by the length of the effort arm. For the wedges (the blades of the posthole digger), the IMA is calculated by the length of the slope divided by the width of the wedge.