Weird VectorForce behaviour

Force.Force = (Mainpart.CFrame.LookVector.Unit) * Speed

The character is set to massless, aswell as seat and part, any idea why this happens?
https://gyazo.com/0999befec820e79dbc94f1662fc6573b

Forces don’t play well with massless objects. F = ma, when you set the force on the object, roblox tries to calculate the resulting acceleration and you get F/0, something that doesn’t make sense.

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