Across
- 3. an engine
- 4. push
- 6. mass sums to 0
- 7. fuel
- 8. takeoff
- 11. launches into the air
- 12. will stay the same unless acted upon
- 13. pulled forcefully
- 14. non constant
- 16. the speed
Down
- 1. equal and opposite reaction
- 2. leading person of rocket technology
- 5. f=ma
- 9. power
- 10. liquid field rocket
- 15. constant