Yes.  Or the second rock.  I was trying to dispel the myth that there is 
something more to be gained if the second rock hits the first.

Dave

Wouter van Ooijen wrote:

>>>Thrust can only be created when you are pushing against 
>>>      
>>>
>>something else. 
>>    
>>
>
>  
>
>>Not true.  It's an "equal and opposite reaction" thing.
>>
>>If you were to throw rocks in free space, you would propel 
>>yourself in 
>>the opposite direction to your rock shower.  It wouldn't make 
>>one bit of 
>>difference if the rocks that you threw then hit rocks that you had 
>>previously thrown.
>>    
>>
>
>So you do agree: it is the first rock you are pushing against.
>
>Wouter van Ooijen
>
>-- -------------------------------------------
>Van Ooijen Technische Informatica: www.voti.nl
>consultancy, development, PICmicro products
>docent Hogeschool van Utrecht: www.voti.nl/hvu
> 
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