Solve the mystery

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Across
  1. 2. The displacement divide by time
  2. 5. An increase in the rate or speed of something
  3. 10. Consists of an abstract coordinate system and set of physical points in a coordinate system
  4. 12. A quantity having only magnitude not direction
  5. 13. When the speed of an object changes at a constant rate
Down
  1. 1. An idea of explanation that you then test through study and experimentation
  2. 3. The speed of something in a given direction
  3. 4. Knowledge or study of the natural world based on facts through experimentation
  4. 6. A system of ideas intended to explain something
  5. 7. Any motion of a body where gravity is the only force acting upon it
  6. 8. A location relative to a reference point
  7. 9. A quantity having direction as well as magnitude
  8. 11. The amount of space in between two things
  9. 12. A rate at which someone or something is able to move or operate