1 A see-saw is supported at the center. A 40kg boy sits at the left, 4 m away from the center, and a girl sits 5 m to the right of the center. The see-saw is balanced. What is
the mass of the girl?

Which statements best describe energy? check all that apply. the total amount of energy in the universe remains constant. the total amount of energy in the universe changes constantly. energy cannot be converted from one form to another. energy can be converted from one form to another. energy cannot be created or destroyed. energy can be created or destroyed.