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S = 47cm2 = 0,0047m2
g = 10m/s2
Fn = mg = 48kg * 10m/s2 = 480N
p=Fn/S
p=480N/0,0047m2 = 1021276Pa - jedna stopa
p=480N/0,0094m2 = 51063,8Pa - dwie stopy