A ball is projected upwards from the top of tower with a velocity \( 50 \mathrm{~ms}^{-1} \) mak...

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A ball is projected upwards from the top of tower with a velocity \( 50 \mathrm{~ms}^{-1} \) making an angle \( 30^{\circ} \) with the horizontal. The height of tower is \( 70 \mathrm{~m} \). After how many seconds from the instant of throwing will the ball reach the ground
[DPMT 2004]
(a) \( 2 \mathrm{~s} \)
(b) \( 5 \mathrm{~s} \)
(c) \( 7 \mathrm{~s} \)
(d) \( 9 s \)
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