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0.9 of a mark?Seriously?
there will be nowhere in the universe that has a 0 field.
(In fact my model asks you to consider that these spaces in between galaxies, and the physical space taken up by galaxies, were previously taken up by a uniform sea of individual particles that have pulled together resulting in galaxies and tracts of open space in-between.)Gravity in open space reduces in strength by the inverse square law, so while these deep space areas will have extremely weak fields, there will be nowhere in the universe that has a 0 field.
A vector is a direction.
Under this remit there can only be 2 directions, (I think, scratches head)... One being moving into a stronger gravity field, and the other being moving into a weaker gravity field.
Firstly Colin, you are using different speeds to describe the scenario, so it's no wonder that you are confusing yourself.
Using a fraction of a mark to calculate is highly illogical and totally irrelevant.
Keeping the speed constant, the lane 1 car in lane 1 makes 100 marks at 10 marks per standard second that are 1 metre apart, in a duration between start and stop light that is 10 standard seconds long.10 marks per second is our constant speed throughout. It is only the length of the second that changes.