How to apply velocity onto parts?

[fair wind]

I made these abilities to fling blocks towards the player's cursor, and im not gonna lie i didnt know how so i asked chatgpt, it told me to use AssemblyLinearVelocity. However its extremely buggy and sometimes the blocks dont move, just fall to the ground, or do fling but lag a lot. Its apparent to me that this cant be the best way to make the blocks move. I want a set speed, not speed based on distance. Is there another type of velocity? what should i use that isn't absolutely horrid?

  local speed = 1000
  
  local dir = (mousepos - part.Position).Unit
  part.AssemblyLinearVelocity = dir * speed
                    
  game:GetService("Debris"):AddItem(part, 3)

lags even at low speeds, also this code is looped through a group of parts, so the player can select parts and then fling them all at once. However lag is still there with just one part, so im positive it isnt the looping that is causing the lag

[daring galleon]

I recommend using either bodyforce or bodyvelocity , despite being deprecated they're still reliable.

another thing, the speed might be different than what you're looking for, so just try different speeds till you get one you want.

[odd schooner]

** You are now Level 1! **

[fair wind]

tysm goat

[left cloak]

Like tossing a basketball perhaps?

Look on :ApplyImpulse()

Way more cleaner

[zenith oriole]

you can use applyimpulse

[odd schooner]

** You are now Level 1! **

[zenith oriole]

if its a model do it on its primary part

[fair wind]

alright thanks

you guys solved my question but another one: what if i wanted to apply a constant velocity?

like if i wanted something to fly in the air and not just fling it

actually nevermind