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The way I see it and I am not scientist is that if I am on a bike going 90MPH and I throw a ball at 20 mph the ball will move forward at 110 mph as it takes my initial momentum. If I am on a bike at 90mph and I switch on a flashlight the light will not move forward 90+SOL because photons having no mass will not carry the energy of my initial momentum. Also check this out if you are interested in a basic course on physics:

[URL unfurl="true"]http://webcast.berkeley.edu/course_details.php?seriesid=1906978517[/URL]


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