science

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Across
  1. 4. object acceeleration
  2. 5. the amount of matter
  3. 9. part not changed
Down
  1. 1. spped and direction
  2. 2. one that responds
  3. 3. equal an opposite reaction
  4. 6. amount of force
  5. 7. measure of gravity
  6. 8. power to do work