Final answer:
The work done to pull the rope to the top can be calculated using the formula: Work = Force * Distance. In this case, the force is the weight of the rope and the distance is the height of the building. The work done is 980 J.
Step-by-step explanation:
To calculate the work done in pulling the rope to the top, we need to consider the mass of the rope and the height it is being lifted. Work is equal to force multiplied by distance. In this case, the force is the weight of the rope and the distance is the height of the building. The weight of the rope can be calculated by multiplying the mass density by the length of the rope and the acceleration due to gravity, and the distance is given as 10 m. So, the work done can be calculated as:
Work = (Mass density * Length * acceleration due to gravity) * Distance
Work = (0.5 kg/m * 20 m * 9.8 m/s^2) * 10 m = 980 J
The correct answer is 980 J.