A ball is projected from the ground at a speed of \( 10 \mathrm{~ms}^{-1} \) making an angle of ...

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A ball is projected from the ground at a speed of \( 10 \mathrm{~ms}^{-1} \) making an angle of \( 30^{\circ} \) with the horizontal. Another ball is simultaneously released from a point on the vertical line along the maximum height of the projectile. Both the balls collide at the maximum height of first ball. The initial height of the second ball is \( \left(g=10 \mathrm{~ms}^{-2}\right) \quad \) [Kerala PET 2007]
(a) \( 6.25 m \)
(b) \( 2.5 m \)
(c) \( 3.75 m \)
(d) \( 5 m \)
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