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i have a boat and a buoy
the buoy is made from aluminium and the other ring is welded in 90 degrees angle

i assume that the weld would stand around 300kg/600lbs of weight on top of it before breaking

my boat is 4000kg/8800lbs, i calculated that if it moves 3mph or 5kmh it would make around 3800 J of kinetic energy, how does this convert into lbs thinking of the weight on the link..?