A ball is projected upwards from the top of a tower with a velocity of $50\, ms^{-1}$ making an angle of $30^o$ with the horizontal. The height of the tower is $70\, m$. After how many seconds from the instant of throwing will the ball reach the ground ?.......$s$
- A$2 $
- B$5 $
- C$7$
- D$9$
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- [AIPMT 2013]
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