How to calculate the speed of a vehicle (seat)?

Ive tested this in studio. It might not be what you want. But this is what I found out and it works when I tested a car

local speed = 0

while (true) do
local p1 = script.Parent.Position
local t = wait()
local p2 = script.Parent.Position
local d = (p1-p2).magnitude
speed = math.floor(d/t)
print(speed) -- Showing the speed on the output
end

Velocity is a Vector3 value, and every Vector value has a magnitude. The magnitude of a vector is basically how long the vector is, or the distance between itself and (0,0,0). In order to get the magnitude of a Vector, you simply type the name of the Vector and put .magnitude at the end of it to get the magnitude, like so:

local Speed = script.Parent.Velocity.magnitude

Hope this helped!

this script goes inside the seat.

local sp = script.Parent

while wait() do local speed = math.floor(sp.Velocity.magnitude + .5)

print(speed)

end