The diagram represents a uniform beam with a length of $100\ \text{cm}$. The diagram is not drawn to scale. The beam is in equilibrium on a pivot at the $50\ \text{cm}$ mark, under the influence of forces of $4.0\ \text{N}$, $5.0\ \text{N}$ and $6.0\ \text{N}$. The $4.0\ \text{N}$ force acts at the $20\ \text{cm}$ mark, and the $6.0\ \text{N}$ force acts at the $60\ \text{cm}$ mark. At what point on the beam does the $5.0\ \text{N}$ force act?
- Aat the $62\ \text{cm}$ mark
- Bat the $74\ \text{cm}$ mark
- Cat the $86\ \text{cm}$ mark
- Dat the $88\ \text{cm}$ mark