Consider an inertial frame S' moving at a speed \(\frac{c}{3}\) away from another inertial frame S along the common x-axis, where c is the speed of light. As observed from S', a particle is moving with speed in \(\frac{c}{3}\) the y' direction as shown in the figure. The speed of the particle as seen from S will be
1
\(\frac{\sqrt{15}}{9} c\)
2
\(\frac{\sqrt{17}}{9} c\)
3
\(\frac{\sqrt{21}}{9} c\)
4
\(\frac{\sqrt{18}}{9} c\)