A jet of water issues from a circular orifice of 25 mm diameter, under a constant head of 1metre. It falls 35 mm vertically down and strikes the ground at a distance of 350 mm from the center of the vena contracta. If the discharge through the jet is 1.35 litres/s find: (a) Co-efficient of discharge; (b) Co-efficient of velocity; (c) Co-efficient of contraction.