The diagram depicts a laboratory experiment in which a feather drops from rest through a long vertical evacuated tube of length $L$. The feather takes time $T$ to travel from the top to the bottom of the tube. How far down from the top of the tube has the feather fallen in time $0.50T$?
- A$0.13L$
- B$0.25L$
- C$0.38L$
- D$0.50L$