A cantilever beam of length $2 \mathrm{~m}$ with a square section of side length $0.1 \mathrm{~m}$ is loaded vertically at the free end. The vertical displacement at the free end is $5 \mathrm{~mm} .$ The beam is made of steel with Young's modulus of $2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}$. The maximum bending stress at the fixed end of the cantilever is

(A) $20.0 \mathrm{MPa}$

(B) $37.5 \mathrm{MPa}$

(C) $60.0 \mathrm{MPa}$

(D) $75.0 \mathrm{MPa}$

A cantilever beam of length $2 \mathrm{~m}$ with a square section of side length $0.1 \mathrm{~m}$ is loaded vertically at the free end. The vertical displacement at the free end is $5 \mathrm{~mm} .$ The beam is made of steel with Young's modulus of $2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}$. The maximum bending stress at the fixed end of the cantilever is

(A) $20.0 \mathrm{MPa}$

(B) $37.5 \mathrm{MPa}$

(C) $60.0 \mathrm{MPa}$

(D) $75.0 \mathrm{MPa}$

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