A seesaw is a toy that consists of a long and narrow board balanced and fixed at its central point (pivot). In this toy, two people sit at the ends and, alternately, push themselves upward, causing the opposite end to descend, thus performing the seesaw movement. Consider the seesaw represented in the figure, in which points $A$ and $B$ are equidistant from the pivot. The orthogonal projection of the trajectory of points $A$ and $B$, on the plane of the seesaw ground, when it is in motion, is: (A), (B), (C), (D), (E) [as shown in the figures]
A seesaw is a toy that consists of a long and narrow board balanced and fixed at its central point (pivot). In this toy, two people sit at the ends and, alternately, push themselves upward, causing the opposite end to descend, thus performing the seesaw movement.
Consider the seesaw represented in the figure, in which points $A$ and $B$ are equidistant from the pivot.
The orthogonal projection of the trajectory of points $A$ and $B$, on the plane of the seesaw ground, when it is in motion, is:
(A), (B), (C), (D), (E) [as shown in the figures]