1) Can the work done by the force of kinetic friction on an object ever be positive? If \"yes," give an example. If \"no," explain why I 2) Can the work done by the force of Earth's gravity on an object ever be positive? If \"yes," give an example. If \"no," explain why 3) A 275-kg potted plant rests on the floor. Determine the work required to move the plant at a constant speed i. to a shelf 1.37 m above the floor 9. along the shelf for 1.07 m where the coefficient of kinetic friction is 0.549