PhilosophicallyMindedPeople

• The scientifically minded person asks why it falls downwards
  

This one's a bit dubious, as well....at least for a modern scientist. "Downwards" is defined as the direction in which it falls. "The scientifically minded person asks why it falls towards the earth" is probably what you were looking for. --SF

• The mathematically minded person asks how long it will take
  

Hmm... I might suggest that's the statistically minded person. MathematicallyMindedPeople might ask what the path it's traversing is, taking into account the gravity of the surrounding objects; or what the pattern to its leaves is, and whether they're in the FibonacciSequence?; or some such...  --AC

• The engineering oriented person asks why the apple stalk was insufficiently strong
  
• The philosphically minded person asks how we may know we are not the apple dreaming we are humans watching ourselves fall
  

• The theologian asks, with regard to the apple, why there is something, rather than nothing, and immediately answers "God".
  
• The physicist asks, with regard to God, why there is something, rather than nothing, and immediately answers "because the nothing exploded".
  

..or something. I'm sure there's a witty comment there, it's just that my sense of humour has gone walkies. - MoonShadow