1. The problem statement, all variables and given/known data A shopper in a supermarket pushes a cart with a force of 35.0 N directed at an angle of 25.08 below the horizontal. The force is just sufficient to balance various friction forces, so the cart moves at constant speed. (a) Find the work done by the shopper on the cart as she moves down a 50.0-m-long aisle. (b) The shopper goes down the next aisle, pushing horizontally and maintaining the same speed as before. If the friction force doesn’t change, would the shopper’s applied force be larger, smaller, or the same? (c) What about the work done on the cart by the shopper? I only don't understand (c) 2. Relevant equations W = Fd 3. The attempt at a solution The answer for (c) is "the same" (as the answer of (a) which is 1586N). I understand since the car travels the same distance, the work done by force should be the same as (a), but if I use W = Fd to calculate (c), it should be W = (35)(50) which is not the same as (a). So, why is that? Thanks!