In Force Analysis for a Single System, you saw a strategy for force analysis. Approaching a context from an energy perspective follows a similar structure, but the goals are often different.
Many problems in physics can be solved multiple ways. Since both ways should result in the same answer, this can be a strong confirmation that an answer is correct. Often, Force Analysis and Energy Analysis provide two distinct ways of solving a problem.
In Practice Calculating Work, you considered the situation of pulling a box across a flat, level floor using a rope that makes an angle to the horizontal. Assuming you know the tension in the rope, find the speed of the box after it has traveled across the room.
