4.
If a student on Earth holds a
-kilogram rock
meters above the ground, what is the gravitational potential force of the rock?
2.5 J
10 J
98 J
24.5 J
The correct answer is: 24.5 J
The gravitational potential energy of an object is calculated using the formula: PE = mgh, where m is the mass of the object (in kg), g is the acceleration due to gravity (approximately 9.8 m/s^2 on Earth), and h is the height of the object above the ground (in meters).
In this case, the mass is 4 kg, the height is 2 meters, and g is 9.8 m/s^2. Plugging these values into the formula:
PE = (4 kg)(9.8 m/s^2)(2 m) = 78.4 J
Therefore, the gravitational potential energy of the rock is 78.4 J.