From: relativity@paulba.no   
      
   Den 28.01.2026 07:56, skrev Maciej Woźniak:   
   > On 1/27/2026 8:24 PM, Paul B. Andersen wrote:   
   >>   
   >> I now understand why you thought that   
   >> if the speed of an object is constant zero   
   >> in its own rest frame, then the acceleration   
   >> must be zero.   
      
   > I now understand why you constantly lie and   
   > slander. I always did.   
   > That's what your moronic religion train its   
   > doggies for.  Apart of that they are usually   
   > unable for anything, just like you.   
      
   Given a spacecraft with mass m = 1000 kg somewhere in space.   
   A rocket engine is pushing the spacecraft with a force F = 10000 N.   
   The proper acceleration of the spacecraft is a = F/m = 10 m/s².   
      
   Can you tell me what the speed v of the spacecraft is?   
   Hint: d²v/dt² = 10 m/s²   
      
   >> The "proper acceleration" of an object is by definition   
   >> the acceleration measured in the object's rest frame.   
      
   > And a proper shark is by definition (by definition   
   > I wrote) - a farm animal with thick wool that eats   
   > grass and is kept for its wool, skin, and meat.   
   >   
   > Proper sharks eat grass. Sharks eating fishes   
   > are improper sharks. Experiments confirm!!!!!   
   >   
   > BTW. You wrote:   
   >   
   > 1)an object is always at rest (velocity 0)   
   > in its rest frame   
   > 2)proper acceleration of an object is its   
   > acceleration  measured  in its rest frame   
   >   
   > 1+2=3) the proper acceleration of any   
   > object is always 0.   
   > Sorry, poor trash.   
      
   Now I know that you still think that if a spacecraft   
   with mass 1000 kg is pushed by a rocket engine with   
   the force F = 10000 N, then the proper acceleration of   
   the spacecraft is a = 0  because the speed of the spacecraft   
   relative to itself is 0 m/s.   
      
   --   
   Paul   
      
   https://paulba.no/   
      
   --- SoupGate-Win32 v1.05   
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