Subject: please tell me how to figure the force applied from an 1800lb. weight

 this question applied to pile driving in a marshy area of long island , NY
could you please tell me how much force is applied from an 1800 pound weight 
dropped from say, 10 feet onto a 300 pound weight atop a telephone pole 
standing on its end (8" round tip) 
when these piles are driven, they might only move 1/4" per blow (when it begins 
to "fetch up")
 I recently drove a pile that only moved 1" after 60 blows (a very sandy area) 
could you please include the formula for me also
I am aware of the equation F=MxA but am unsure of the units of measurement to 
use     
                                 ------many thanks
                                           Jim Tyrrell

Re: please tell me how to figure the force applied from an 1800lb. weight