Final answer:
Georgie did 4992 joules (J) of work by pulling her brother in a sled for 128 meters with a constant force of 39 N.
Step-by-step explanation:
The student asks about the work done by Georgie when she pulls her brother on a sled. The concept to use here is the work-energy principle from physics, which is defined as the product of the force applied to an object and the distance over which that force is applied, when force and distance are in the same direction. The formula to calculate work is Work (W) = Force (F) × Distance (d), where the force is in newtons (N) and the distance is in meters (m). For Georgie pulling the sled, the force is 39 N and the distance is 128 m.
The work done by Georgie is therefore:
W = F × d = 39 N × 128 m = 4992 J
So Georgie does 4992 joules (J) of work.