Energy, work and power — practice question

A small bead $Q$ is able to slide without friction along the smooth horizontal straight wire $AB$, which has length $3\,\text{m}$. As shown in the diagram, three horizontal forces with magnitudes $F\,\text{N}$, $10\,\text{N}$ and $20\,\text{N}$ act on the bead. The three forces have a resultant of magnitude $R\,\text{N}$, acting in the direction indicated in the diagram.