If at an instant the velocity of a projectile be \( 60 \mathrm{~m} ...

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If at an instant the velocity of a projectile be \( 60 \mathrm{~m} / \mathrm{s} \) and its inclination to the horizontal be \( 30^{\circ} \), at what time interval (in sec) after that instant will the particle be moving at right angles to its former direction. \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
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