A bead \( P \) sliding on a frictionless semi-circular string \( (ACB) \) and it is at point \( S \) at \( t = 0 \) and at this instant the horizontal component of its velocity is \( v \). Another bead \( Q \) of the same mass as \( P \) is ejected from point \( A \) at \( t = 0 \) along the horizontal string \( AB \), with the speed \( v \), friction between the beads and the respective strings may be neglected in both cases. Let \( t_{p} \) and to be the respective times taken by beads \( P \) and \( Q \) to reach the point \( B \), then the relation between \( t_{p} \) and \( t_{Q} \) is:
