A ball moving with velocity \( 9 \mathrm{~ms}^{-1} \) collides with another similar stationary b...

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A ball moving with velocity \( 9 \mathrm{~ms}^{-1} \) collides with another similar stationary ball. If after the collision, both the balls move in directions making an angle of \( 30^{\circ} \) with the initial direction, then their speeds after collision will be
(a) \( 5.2 \mathrm{~ms}^{-1} \)
(b) \( 0.52 \mathrm{~ms}^{-1} \)
(c) \( 52 \mathrm{~ms}^{-1} \)
(d) \( 26 \mathrm{~ms}^{-1} \)
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