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a ball is thrown horizontally from a height of 20 m.if it hits ground with a velocity three times the initial velocity.find its initial velocity.

a ball is thrown horizontally from a height of 20 m.if it hits ground with a velocity three times the initial velocity.find its initial velocity.

Grade:11

2 Answers

Niraj Bishnoi
50 Points
6 years ago
I really wish I could have showed with a diagram but anyways, 
We know that,
     v²=u²+2as (right)
i.e   (3u)²=u²+2gh (since a=g)
        9u²=u²+2x10x20
         8u²=20x20
          u²=400/8
          u²=50
          u=5 root 2 is the answer.
Niraj Bishnoi
50 Points
6 years ago
Initial velocity=5sqrt(2)m/s
I’m so sorry I clicked it twice and you know there is no cancel button, but anyways this is the final answer and i don’t think there’s “a better answer”
 
 

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