Why do planes slow down after takeoff?

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Tags

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2. #landing
3. #causing
4. #problem
5. #altitude
6. #reduced
7. #acceleration
8. #cruising
9. #slowing
10. #after
11. #setting
12. #takeoff
13. #thrust
14. #really
15. #climb
16. #flying
17. #descent
18. #reducing
19. #sensation