Final answer:
The mass of the rock is 1228.9 kg.
Step-by-step explanation:
To find the mass of the rock, we can use the formula:
Weight = mass × gravitational field strength
Given that the gravitational field strength on the moon is 1.63 N/kg and the weight of the rock is 2000 N, we can substitute these values into the formula:
2000 N = mass × 1.63 N/kg
Solving for mass, we get:
mass = 2000 N / 1.63 N/kg = 1228.9 kg
Therefore, the mass of the rock is 1228.9 kg.