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ChainBreaker-
mine - it got the equation wrong solving for F, and it's not as if I checked it at all. I've updated with the what it's corrected it to.
prob still bollocks though. @duncs answer is simpler & prob. accurate
NotThamesWater
Divide by 9.8 - so approx 36kg and 42kg
Which is bollocks.
So chatgpt got it wrong.
Idiot supercomputer AI.