A block with mass $4.9\,\text{kg}$ is moved at steady speed from point P at the foot of an inclined plane to point Q at the summit. A force of $64\,\text{N}$, applied parallel to the slope, pushes the block. The plane is set at an angle of $20^\circ$ to the horizontal, and the block rises through a vertical distance of $5.8\,\text{m}$. What is the work done against the frictional force acting on the block between P and Q?
- A$280\,\text{J}$
- B$810\,\text{J}$
- C$960\,\text{J}$
- D$1100\,\text{J}$