Group 1

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Across
  1. 1. Speed past
  2. 5. Urgent speed
  3. 7. Sci-fi faster-than-light speed
  4. 9. Very fast
  5. 11. Rate of motion
  6. 17. A short fast run
  7. 18. Hurry up
  8. 20. Mass in motion
Down
  1. 2. Speed of sound
  2. 3. Fast plane
  3. 4. Super quick or bright
  4. 6. Quick as a bird
  5. 8. Speed of walking or running
  6. 10. Increase in speed
  7. 12. Storm's fast spark
  8. 13. Speed up a process
  9. 14. Opposite of slow
  10. 15. A quick movement
  11. 16. Engine speed booster
  12. 19. Fast-moving group