A uniform bridge span of weight 1200 kN and of length 17.0 m rests on a support of width 1.0 m

A uniform bridge span of weight 1200 kN and of

length 17.0 m rests on a support of width 1.0 m at
either end. A stationary lorry of weight 60 kN is the
only object on the bridge. Its centre of mass is 3.0m
from the centre of the bridge.
15.0 m

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