What is VX and VY in physics? In a projectile motion let v X and v y be the horizontal and vertical components of velocity at any time t and x and y be the displacements along horizontal and vertical from the point of projection at any time t. ThenA. vy t graph is a straight line with negative slope and positive intercept.B. VY= Best Rate of climb speed all engines OP. VX= Best Angle of climb speed all engines OP. FROM FCTM A320. Once airborne The speed can be selected on FCU to achieve the maximum RATE of climb or the maximum GRADIENT of climb. The speed to achieve the maximum RATE of Climb ie.To reach a given altitude in the SHORTEST TIME ,lies between ECON climb I basically start with information in the form x,y,z,vx,vy,vz. I then have to calculate a force for which the equations work in azimuthal and radial values and depend on the azimuthal and radial velocities (in the same units as vx,vy,vz). So I have to first convert vx and vy into rotational velocity and radial velocity. Then the resulting force 17-12-2007, 08:32 PM. for the difference in dollars I'd say take the VU, IMO the sharper angles did not suit the overall shape of the utes. drivetrain wise aside from the 10kw extra (which I cant feel between the two) are identical. Early VY had the VU taillights (not clear). Interior the VY seats less comfy and cabin looks silly with the VT At 5,000ft, (still in a steady climb) stop the stopwatch, Note the time it took to climb through 1000ft, then come back down to 3,500ft again, and repeat this at (say) 5 knots faster. Keep repeating this until you are convinced that you're above either Vx or Vy, then go home. Write all this down in a table, add a few extra columns, and work out cyjtN.