!
!  Compute how long to fire horizontal thrusters so that the total fuel
!  consumed is minimized.  The minimum value of the function is the total
!  amount of fuel that will be used.  The 'time' parameter is the length
!  of time that the horizontal thruster should be fired (in seconds).
!
Title Compute fire time for thruster to minimize total fuel consumption
Register		! Please register your use of Nonlin
Constant G=1.67		! Gravitational acceleration on moon (meters/sec^2)
Constant A=1.10		! Acceleration from horizontal thruster (meters/sec^2)
Constant burnrate=2.3	! Kg/sec fuel burn rate to produce 1 G acceleration
Constant dist=200	! Horizontal distance to be moved (meters)
Parameter time		! Number of seconds to fire horizontal thruster
Function burnrate*(2*time*A/G + 2*time + (dist - A*time^2)/(A*time))
Data