At high altitude, a body explodes at rest into two equal fragments with one fragment receiving h...

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At high altitude, a body explodes at rest into two equal fragments with one fragment receiving horizontal velocity of \( 10 \mathrm{~m} / \mathrm{s} \). Time taken by the two radius vectors connecting point of explosion to fragments to make \( 90^{\circ} \) is
[EAMCET (Engg.) 1995; DPMT 2000]
(a) \( 10 s \)
(b) \( 4 s \)
(c) \( 2 s \)
(d) \( 1 \mathrm{~s} \)
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