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  1. Time     Time to fall
  2. Distance Distance                       Meters
  3. Vo       Initial velocity               Meters/second
  4. g        Gravitational acceleration     Meters/Second²
  5. Hi       Height of image                cm or inches
  6. Ho       Height of object               cm or inches
  7. Si       Distance from lens to image    cm or inches
  8. So       Distance from lens to object   cm or inches
  9. f        Focal length of the lens       cm or inches
  10. Nt       Number of atoms after time t
  11. No       Initial number of atoms
  12. k        Disintegration constant        1/seconds
  13. F        Gravitational force
  14. G        Gravitational constant         N-m²/Kg²
  15. M1       Mass of body 1                 Kg
  16. M2       Mass of body 2                 Kg
  17. S        Distance between bodies        Meters
  18. P1       Initial Pressure               N/cm²
  19. P2       Final Pressure                 N/cm²
  20. T1       Initial Temperature            °K
  21. T2       Final Temperature              °K
  22. V1       Initial volume                 cm²
  23. V2       Final volume                   cm²
  24. V        Volume                                         
  25. h        height                                         
  26. l        length                                         
  27. w        width                                          
  28. SA       Surface area                                   
  29. r        radius                                         
  30. π        Pi                                             
  31. Y        Y coordinate of point                          
  32. X        X coordinate of point                          
  33. X1       Previous X coordinate                          
  34. X2       Next X coordinate                              
  35. Y1       Previous Y coordinate                          
  36. Y2       Next Y coordinate                              
  37. Range    Projectile range               Meters          
  38. Angle    Angle of projection            Degrees         
  39. Velocity Initial velocity               Meters/second   
  40. d        discriminant                                   
  41. a                                                       
  42. b                                                       
  43. c                                                       
  44. a        Coefficient of x²                              
  45. b        Coefficient of x                               
  46. R1       Radius of curvature surface 1  cm or inches    
  47. R2       Radius of curvature surface 2  cm or inches    
  48. n        Relative refractive index                      
  49. Root1    First quadratic root                           
  50. Root2    Second root                                    
  51.