A horizontal moving belt walkway at the airport moves at a constan velocity of v = 3m/si, to the east relative to the ground, theground is at rest. A passenger is walking quickly at a constan velocity of v = 4m/si, to the east relative to the walkway. At Initial timet = 0.0s the passenger dropped her airpod from height of h = 1.70. What Formula is used to obtain the time it takes for the airpod to fall on the walkway?