In each of the diagrams below, one or more external forces act on the indicated system. Which of the forces listed below are the reaction to the external force mentioned? (Select all th (a) the mower exerts a force downward on the ground due to contact o upward on the Earth due to gravitational attraction - upward and to the left on the handle downward on the Earth due to gravitational attraction * upward on the ground due to contact Consider just the external forces acting on the system of interest to find the reaction forces. Earth Moon Sun (b) the Moon exerts a force e to the right on the Sun to the left on the Sun e upward on the Earth to the right on the Earth - to the left on the Earth a downward on the Earth Consider just the external forces acting on the system of interest to find the reaction forces. (c) the negatively charged electron (labeled e in the diagram) exerts a force to the right on the negative plate * downward on the Earth to the left on the negative plate * upward on the Earth