A raindrop is released from rest and moves straight down through air. The graph shows how its speed varies with time. Which statement about the raindrop is correct?
- AAt point $X$, the raindrop has an acceleration of $9.81\,\text{m s}^{-2}$.
- BAt point $Z$, the force on the raindrop due to air resistance has reached its maximum value and so the acceleration of the raindrop has also reached its maximum value.
- CAt point $Z$, the force due to air resistance is equal and opposite to the weight of the raindrop and so the speed of the raindrop is zero.
- DThe resultant force on the raindrop at point $Y$ is less than the resultant force on the raindrop at point $X$.