An unbalanced force cannot change the direction in which an object is moving.

Well, first of all, there's no such thing as "an unbalanced force".
It's the GROUP of all forces acting on the object that's balanced or unbalanced.

The statement is as false as it can be.  An unbalanced group of forces
acting on an object is the ONLY way to change the direction in which
the object is moving.

Distance^2= yellow line ^2 (see picture) = 30^2 + 49^2so distance = squareroot of (300^2 +49^2)i dont know if this is how to solve it, but i cnt think of another way

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.