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ttps://edugen.wileyplus.com/edugen/student/mainfr.uni Search aan Excel tutorial on t R/GA: An Integrated, D Startup Jobs-Searc-G Expert Preferred Res.. SEO: The Beginners. Other Bookmark S Halliday, Fundamentals of Physics, 10e PHYSICS FOR SCI MJRS (PHYS 20700/20800) BACK Chapter 08, Problem 010 You drop a 2.30 ka book to a friend who stands on the ground at distance D 12.0 m below. Your friend's outstretched hands are at distance d 1.80 m above the ground (see the figure). (a) What is the speed of the book when it reaches her hands? (b) If we substituted a second book with twice the mass, what would its speed be when it reaches her hands? (c) If, instead, the book were thrown down with initial speed 7.80 m/s, what would be the answer to (a)? (a) Number (b) Number (c) Number

Explanation / Answer

a) speed of the textbook = sqrt [2 g h]

= sqrt [2 * 9.8 * (12 - 1.8)]

= 14.1 m/s

b) speed when it reaches her hands = 14.1 m/s

c) speed of the textbook = sqrt [2 g h + vi2]

= sqrt [2 * 9.8 * (12 - 1.8) + 7.82]

= 16.1 m/s

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