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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Global Edition
3
Kinematics in Two Dimensions; Vectors
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3-2 to 3-4: Vector Addition
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3-5 and 3-6: Projectile Motion
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3-8: Relative Velocity
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Problem 20
A
7.7 m/s7.7\textrm{ m/s}
Giancoli 7th "Global" Edition, Chapter 3, Problem 20 solution video poster
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COMMENTS
By arishenryl on Wed, 9/28/2022 - 12:53 AM

Hi,
Why do we use the general velocity formula to find initial velocity rather than the 3rd kinematics equation used earlier to find the time? Couldn't we substitute 9.5m as the displacement and then solve for the initial velocity?

By Mr. Dychko on Thu, 9/29/2022 - 4:25 PM

Hi arishenryl, I'm not entirely sure which formulae you're referring to, but the idea here is that we know how far horizontally the ball goes, so if we can find its time spent travelling we can then calculate vx=dxtv_\textrm{x} = \dfrac{d_\textrm{x}}{t}.
All the best,
Shaun

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