what i have been trying to do is if the velocity of an object that is less than 40 in the x direction then i want it to removeSelf(), how do i accomplish this?? thanks!

Something like this should do the trick;

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local function checkVelocity()
vx, vy = obj:getLinearVelocity()
  if vx < 40 then
    obj:removeSelf()
  end
end