A clearvelocity() function sounds great!!!

Then I could do something like:

var force[3];

force = 100000;

me = pPlayer;
you = pBall;

clearvelocity(you); //new clear velocity function

phent_enable(you,1);

temp.x = cos(my.pan) * force;
temp.y = sin(my.pan) * force;
temp.z = 0;

phent_addcentralforce(you,temp);