The folks at Car and Driver have a cool write up in their November issue :
How to Throw a Subaru Impreza WRX STI into the Atmosphere
The physics behind rally driver Ken Block’s jumps.

The write up looks into the evolution of car jumping and the adaptation of the same basic physics formulas used to plot the trajectory of cannon balls, arrows, and more recently, snowboarders.
Dropping the Science looks like this:

Where:
Vt is velocity of the “projectile” leaving the ramp in ft/sec
Vv is the vertical component of this velocity (Vv = sin A (Vt))
Vh is the horizontal velocity (Vh = cos A (Vt))
A is the jump angle
X is horizontal distance traveled
Y is vertical distance
G is the good ol gravitational constant of 32.17 feet per second second²
Now we fully recommend you try this at home. Send your questions and emails to Ken Block...
See the full spread online here...