A ball is projected upwards from the top of tower with a velocity 
making an angle 
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
Text Solution
Verified by ExpertsThe correct answer is:
C
The vertical component of velocity of projection 
If t be the time taken to reach the ground,
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ 
⇒ ⇒ t = – 2 s and 7 s
Since, t = – 2 s is not valid \ \ t = 7 s
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