The graph illustrates how a quantity $y$ changes with a quantity $x$ for an object falling through air at constant (terminal) velocity in a uniform gravitational field. Which quantities might $x$ and $y$ be?
- A$x$: air resistance, $y$: acceleration
- B$x$: loss of height, $y$: gain in kinetic energy
- C$x$: loss of potential energy, $y$: work done against air resistance
- D$x$: time, $y$: velocity