Motion in A Plane

Question: A ball is projected upwards from the top of tower with a velocity $50\,\,m{s^{ - 1}}$ making an angle ${30^o}$ with the horizontal. The height of tower is 70 m. After how many seconds from the instant of throwing will the ball reach the ground



1) 2 s
2) 5 s
3) 7 s
4) 9 s
Solution: Explanation: Explanation
oblique-projectile-motion

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