In which situation is no work being done? A. a person carrying a box from one place to another B. a person picking up a box from the ground C. a person pushing a box from one place to another D. a person pulling a box from one place to ano

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.