A platform is moving upwards with an acceleration of \( 5 \mathrm{~m} \mathrm{~s}^{-2} \). At th...
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0A platform is moving upwards with an acceleration of \( 5 \mathrm{~m} \mathrm{~s}^{-2} \). At the moment when its velocity is \( u=3 \mathrm{~m} \mathrm{~s}^{-1} \), a ball is thrown from it with a speed of \( 30 \mathrm{~m} \mathrm{~s}^{-1} \) w.r.t. platform at an angle of \( \theta=30^{\circ} \) with horizontal. The time taken by the ball to return to the platform is
(1) \( 2 \mathrm{~s} \)
(2) \( 3 \mathrm{~s} \)
(3) \( 1 \mathrm{~s} \)
(4) \( 2.5 \mathrm{~s} \)
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