Value of bending moment in kN-m at point C for a beam as

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Value of bending moment in kN-m at point C for a beam as shown in the above figure is _________

1. 58
2. 28 to 28
3. 14
4. 18

Correct Option: B

Here, R_B + R_D = 20 + 40 KN = 60 KN. Also, Bending Moment about point D = 0.
Thus, R_B × 5 – 40 × 2 – 20 × 7.5 = 0
R_B = 46 KN. Thus, R_D = 14 KN.
Thus, bending moment in kN-m at point C = R_D × 2 m = 14 × 2 = 28 kN-m