The centrifugal force due to curvature of track is assumed to act on the bridge at a height of___________________?

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The centrifugal force due to curvature of track is assumed to act on the bridge at a height of___________________?

A. 1.23 m above the rail level
B. 1.50 m above the rail level
C. 1.83 m above the rail level
D. 2.13 m above the rail level