Step 1: Understanding the Concept:
This question is a direct application of the Work-Energy Theorem. This theorem provides a relationship between the net work done on an object and its change in motion (kinetic energy).
Step 2: Detailed Explanation:
The Work-Energy Theorem states that the work done by the resultant of all forces acting on a particle is equal to the change in the kinetic energy of the particle.
This applies to both internal and external forces, as well as conservative and non-conservative forces.
Mathematically, the total work \( W_{total} \) is given by:
\[ W_{total} = W_{external} + W_{internal} \]
According to the theorem:
\[ W_{total} = \Delta K = K_{final} - K_{initial} \]
While work done by conservative forces is related to the negative change in potential energy (\( W_{cons} = -\Delta U \)), and the total work done by external forces relates to the change in total mechanical energy in specific conditions, the sum of "all" forces always equals the change in kinetic energy.
Step 3: Final Answer:
The work done by all forces is equal to the change in kinetic energy.