MathematicsHard53×since 2002Q3182Let u=2z+iz−kiu = {{2z + i} \over {z - ki}}u=z−ki2z+i, z = x + iy and k > 0. If the curve represented by Re(u) + Im(u) = 1 intersects the y-axis at the points P and Q where PQ = 5, then the value of k is :A2B4C1/2D3/2Check answerSkip