Question

Which statement best explains why a paper airplane eventually falls to the ground?

A. The unbalanced forces of air resistance and gravity slow the airplane and pull it down.

B. Inertia prevents new forces from acting on the airplane to keep it up.

C. The force from throwing the airplane loses strength as the airplane moves.

D. Inertia slow s the airplane and pulls it down.

Answer 1

A. The unbalanced forces of air resistance and gravity slow the airplane and pull it down.

Gravity constantly pulls the plane downward while air resistance (and insufficient lift) reduces its forward speed; the resulting unbalanced forces cause it to descend.