For a simply supported beam of span ‘L’ loaded with a point load ‘W’ at midspan, the maximum deflection at midspan is given by:
AW L³ / (48 E I)
BW L³ / (3 E I)
C5 W L³ / (384 E I)
DW L³ / (192 E I)
Explanation
The maximum midspan deflection for a simply supported beam under central point load W is delta = W L³ / (48 E I).

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