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Velocity is given as;v = 60 km/h = 16.667 m/sAcceleration is given as;v2 -vo2 = 2as=> 16.6672 -02 = 2a(30)=> a = 4.62963 m/s2Taking equilibrium of forces;F_{x}=m a\Rightarrow A_{x}=900(4.62963)\Rightarrow A_{x}=4166.667 \mathrm{~N}Taking moment about center of gravity G;M_{G}=0\Rightarrow A_{y}(1.2)+A_{x}(0.9-0.5)=0\Rightarrow A_{y}(1.2)+4166.667(0.9-0.5)=0\Rightarrow A_{y}=-1388.889 \mathrm{~N}\Rightarrow A_{y}=-1389 \mathrm{~N}Negative means downwards....(Answer) ...