Answer:
3.25 N
Step-by-step explanation:
The acceleration of gravity on the moon is about 1.625 m/s^2, but on Earth it is around 9.81 m/s^2. The weight of an object, in newtons, is equal to its mass times the gravity.
Therefore, on Earth, the rock would weight 2.0 kg * 9.81 m/s^2 = 19.62 N
On the moon, the rock would weigh 2.0 kg * 1.625 m/s^2 = 3.25 N