A small stone is dropped into a well. It falls down the well, from rest, with no resistance for 2s. It then hits the
surface of the water and continues to fall vertically through the water until it reaches the bottom of the well.
In the water the downwards velocity of the stone, v ms', is given by v= 20-1, where is the time, in seconds,
measured from when the stone hits the surface of the water. The stone takes 2.5s in total to reach the bottom
of the well.
a Calculate the depth of the well.
b If air resistance is taken into account, would you expect the depth of the well to be greater or smaller than
your answer from part a?