Ibix
Science Advisor
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60kg on that area is about 18.5kPa. A 10kg weight on a 7cm×7cm contact patch is about 20kPa.Yahya Sharif said:The rock of 60 kg on belly area 18 cm length and 18 cm width will extremely damage the belly
I can report I'm still alive. I don't have more weights to hand to test more.
Edit: my twelve year old has sat on my stomach in the past, though, and he's about 40kg. I'm still alive.