Sphere 1 is released from rest from the top of a tall cliff at time \(t = 0\). At a later time \(t = \Delta t\), an identical Sphere 2 is released from rest from the same location. Both spheres fall along the same vertical line in a uniform gravitational field of magnitude \(g\), and air resistance is negligible. Which of the following best describes the shape of the graph of the vertical separation distance \(\Delta y\) between the two spheres as a function of time \(t\) from \(t = 0\) until Sphere 1 reaches the ground?