A hailstone falls from a height of #5# #km#. Ignoring air resistance, what is the hailstone's final velocity? The acceleration due to gravity is #9.8# #ms^-2#.
If we assume no air resistance the velocity is given by:
In order to answer this question it is necessary to assume that air resistance does not act. This is not a very realistic assumption.
Any real object falling has a 'terminal velocity' at which the air resistance acting upward balances the gravitational force acting downward. At that velocity, there is no further acceleration.
For a human skydiver this velocity is about