Two small spheres are launched horizontally from the edge of a cliff of height \(H\) above a level plain. Sphere 1 is launched with an initial horizontal velocity of magnitude \(v_0\), and Sphere 2 is launched with an initial horizontal velocity of magnitude \(2v_0\). Which of the following correctly compares the flight time \(t_1\) of Sphere 1 to the flight time \(t_2\) of Sphere 2 and provides a valid justification?