scott wrote:
>>  Newton's third law still applies, even at relativistic accelerations.
>> If a force is applied to the projectile to make it accelerate at a 
>> certain
>> direction, another force will accelerate something else (ie. the gun)
>> at the opposite direction. I can't think of any way of avoiding that.
> 
> Bolt it to the Earth, then (assuming you're measuring recoil relative to 
> the Earth) the recoil will be avoided.

http://www.xkcd.com/162/

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