Which region is colored orange in the periodic table

Alkali Metals

Explanation:

Most commonly, the color represents what type of element it is (noble gas, alkali metal). This is not always true as different tables follow different coloring schemes

Colored tables are important because they give you an extra dimension of information. A typical periodic table is colored according to element groups, which are elements that share chemical and physical properties. Some element groups are easily identified as columns on the periodic table, but as you move across the table, the trends aren't so clear-cut. The metalloids and nonmetals, for example, don't fall neatly into the same column. Color coding helps identify similar elements such as these at a glance.

8 meters above the spring

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.