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Surface area of one face of the cube = 10*10 cm² = 0.01 meter²

weight of the cube = 5 kg = mass * gravity = 5kg * 10 metres/sec² = 50 newtons

pressure or stress exerted by the cube on the table = force / area through which the force acts
                  = weight / surface area of cube 
               = 50 newtons / 0.01 meter²  = 5, 000 N/m²  or  Pa.

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