a horizontal beam AB of uniform section is simply supported at its ends on a span of 6 m and carries concentrated loads, each of 200kN, at distances of 1.5m. from each of the supports. determine
(A) the central deflection of the beam AB;
(B) the required propping force to be applied vertically at the centre of the span in order to restore this point to the same level as A and B. E=200 GPA; I=400*10^6mm^4