From Second Life Wiki
ApplyImpulse
llApplyImpulse
Description
Function: llApplyImpulse( vector force, integer local );
Applies impulse to object
| • vector
| force
|
|
|
|
| • integer
| local
| –
| boolean, if TRUE, force is treated as a local directional vector instead of region directional vector.
|
|
Instantaneous impulse. llSetForce has continuous push. "Instantaneous" seems to mean a one second impulse, as an application of a force (in newtons) equal to the object's mass (in kg) for one second will accelerate it to a velocity of 1 (in meters per second), which appears to be what happens with this function.