Final answer:
In the absence of air resistance, Roadrunner and Wile E. Coyote, despite their mass difference, will hit the ground simultaneously because all objects fall at the same rate when only gravity is acting upon them.
Step-by-step explanation:
The scenario involves Roadrunner and Wile E. Coyote, who weighs ten times more than Roadrunner, both free-falling from a cliff without considering air resistance. According to the principles of physics and as stated by Einstein's equivalence principle, if no air resistance is considered, all objects, regardless of their mass, fall at the same rate and hence, they both would hit the ground simultaneously. This is because the acceleration due to gravity is constant at 9.8 m/s2 for all objects (neglecting air resistance). Therefore, both Wile E. Coyote and Roadrunner will reach the ground at the same time.