i have the same problem as before,only 3 more questions about it. please help!! how precise is the ruler originally used to measure the string? explain. what is the length of the string to the nearest centimeter? what is the length of the string to the nearest tenth of a centimeter? thanks

According to your previous description, the minimal (smallest) unit in the ruler would define the preciseness. You also answered your other two questions in your previous post. Read it again more carefully.