The potential energy of the rock is 5,880 J.
The potential energy of an object can be calculated using the formula:
PE = m * g * h
- PE = potential energy
- m = mass of the object (in kg)
- g = acceleration due to gravity (approximately 9.8 m/s^2)
- h = height of the object above a reference point (in meters)
Using this formula, we can calculate the potential energy of the rock:
PE = 20 kg * 9.8 m/s^2 * 30 m = 5,880 J