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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Global Edition
4
Dynamics: Newton's Laws of Motion
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4-4 to 4-6: Newton's Laws, Gravitational Force, Normal Force
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4-7: Newton's Laws and Vectors
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4-8: Newton's Laws with Friction, Inclines
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Problem 19
A
  1. −7.4 m/s-7.4\textrm{ m/s}
  2. 2100 N2100\textrm{ N}
Note: In the video the final answer for part (a) is positive, but I should have taken the negative square root to indicate the downward direction of the jumper.
Giancoli 7th "Global" Edition, Chapter 4, Problem 19 solution video poster
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COMMENTS
By jo73 on Fri, 4/17/2020 - 2:28 AM

Why is the initial speed in the second question negative if it was positive in the first section?

By Mr. Dychko on Sat, 4/18/2020 - 5:23 PM

Hello jo73, you're quite right with your observation. The velocity for part (a) is downward, so it should be negative in order to indicate its downward direction. I've updated the quick answer and made a note for other students.

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