The diagram of vane is redrawn with necessary forces as shown below
Total weight of water and vane, W = (10+2)*9.81 = 117.72 N
component of weight along y direction = W cos15 = 117.72*cos15 = 113.7088 N
normal reaction force = 300 N
Net upward force = 300 - 113.7088 = 186.2912 N
Upward force due to jet of water = m*(V1cos45 - 0 ) = A1V1(V1cos45 - 0 )
186.2912 = 1000*0.02*cos(45)*V12
gives, V12 = 186.2912/(1000*0.02*cos45) = 13.172777708
Therefore V1 = 3.6294 m/s
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