Final answer:
The question involves calculating the work done by various forces on an object, a key concept in high school level physics.
Step-by-step explanation:
The student's question involves the concept of work done by various forces on an object in the context of physics. In particular, work calculations are crucial for understanding energy transfer and dynamics in physical systems. This sort of problem typically falls within high school or introductory college-level physics courses and involves using the work formula: work = force x distance x cos(θ), where θ is the angle between the force and the displacement vector.
For example, the work done on the cart by the shopper can be calculated by considering the component of the force exerted by the shopper in the direction of the cart's displacement. Since the cart moves at a constant speed and level ground, the work done by the gravitational force is zero. Moreover, the total work can be found by adding the work done by all the forces acting on the cart.