Final answer:
The force of gravity acting on the rock is 19.6 N, calculated using the formula F=ma with the acceleration due to gravity being 9.8 m/s^2 and the mass of the rock being 2 kg.
Step-by-step explanation:
The force of gravity acting on the rock can be determined by using Newton's second law of motion, which states that force equals mass times acceleration (F=ma). The standard acceleration due to gravity on Earth is approximately 9.8 m/s2. Since the rock has a mass of 2 kg, the force of gravity on the rock is F = ma = 2 kg × 9.8 m/s2 = 19.6 N (Newtons). Therefore, the force of gravity acting on the rock is 19.6 N.