What is the stress on a steel beam with a 1 m2 cross-section if a force of 15,000 newtons is applied to it?

Stress = force on the beam/area of cross section 
force = 15,000 n and cross section area = 1 m²
stress = 15,000/1 = 15,000 n/m² or 15,000 pascals

The answer is b on edgenuity

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