Figure 1 shows the inlet and outlet velocity triangles of a single-stage impulse turbine with symmetrical blades and no blade friction. Steam leaves the nozzle at 500 m/s at α = 20° and the blade speed is 200 m/s; the steam flow is 2 kg/s. Determine (a) the power developed by the blades (answer in kW) and (b) the blade efficiency (answer in %).