Question

The x axis of a trajectory represents its ____________.

Answer 1

#1

The x axis of the trajectory will show the displacement in X direction only

So it is the Horizontal range

Correct answer would be

Displacement in the horizontal direction(my guess)

2

The stone is projected horizontally at height 64.8 m

now we can use kinematics in Y direction

$\Delta y = v_y * t +\frac{1}{2} gt^2$

now we have

$64.8 = 0 + \frac{1}{2}*9.8*t^2$

$t = 3.64 s$

so here it will fall in the air for time t = 3.64 s