re part 2, "Spacetime diagrams" ..
Note that the angles of the lines are 45 degrees, meaning the balls would be travelling at the speed of light in a REAL spacetime diagram ..
.. you must be really good at this ;)
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Note that the angles of the lines are 45 degrees, meaning the balls would be travelling at the speed of light in a REAL spacetime diagram ..
.. you must be really good at this ;)