Question: What is the total mechanical energy of a system if the potential energy is 30 J and the kinetic energy is 20 J?

Options:

1. 10 J
2. 50 J
3. 30 J
4. 20 J

Correct Answer: 50 J

Solution:

Total mechanical energy = Potential energy + Kinetic energy = 30 J + 20 J = 50 J.