A rigid beam of negligible weight is supported by a hinge at A and a rocker at B as shown in the diagram below. It is subjected to a force F = 15 kN at D normal to the beam. a F KN b D C 1.5 m 45 b a 45 A 3 m 1.5 m B Determine the vertical support reaction at A. Input your answer in kN to one decimal place and ignore +/- sign.