Grade 11Modern Physics

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.

khushika rishika

8 Years agoGrade 11

2 Answers

Niraj Bishnoi

8 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

8 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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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.

khushika rishika

2 Answers

Niraj Bishnoi

Niraj Bishnoi

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