Physics about speed

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Across
  1. 6. When something travels faster than the speed of sound, it creates a loud sound
  2. 7. When an object moves at the same speed without changing, it's at constant speed
  3. 11. what is the term for: To be the rate of change of velocity?
  4. 12. Devices that can calculate your speed and position using signals from satellites
  5. 13. A thrown object's curved path is called projectile _________
  6. 15. Who is the fastest person on earth?
  7. 16. What is the speed called for spacecraft that can reaching incredibly high speed when leaving earth orbit
  8. 17. In what sport was the fastest recorded ball thrown
  9. 18. A famous scientist who studied speed
  10. 19. What shrimp has the strike of an 22. caliber bullet
Down
  1. 1. Speed that goes faster the sound
  2. 2. What is another word for speed?
  3. 3. Speed is calculated as distance divided by time (Speed = Distance / Time).
  4. 4. Negative acceleration or slowing down.
  5. 5. What is the measurment called for super-fast space travel?
  6. 8. What is the speed that measures race car (Around the track)
  7. 9. What is the speed for boats and ships called?
  8. 10. what is the fastest mammal on earth?
  9. 14. You can see these when driving on the highway usually having the speed limit on it
  10. 20. This thing has saved countless of live when in a car accident.