Solved Launching objects on count of blocks

Is there any way to use multiply() method on count of blocks?
Sample code:

PHP:

//$p instanceof Player
$nbt = ExamplePlugin::getNBT($p);
$level = $p->getLevel();
$bullet = Entity::createEntity("Snowball", $level, $nbt, $p);
$fdefault = 0.5;
$bullet->setMotion($bullet->getMotion()->multiply($fdefault));
$bullet->spawnToAll();
$p->getLevel()->addSound(new BlazeShootSound(new Vector3($p->x, $p->y, $p->z)));
$p->getLevel()->addParticle(new FlameParticle(new Vector3($p->x + 0.4, $p->y, $p->z)));

So $fdefault should be count of blocks

 

no, i am trying that the snow flew e.g. 15 blocks

 

Thanks alot!