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Sears and Zemansky's University Physics with Modern Physics | 13th Edition | ISBN: 9780321696861 | Authors: Hugh D. Young; Roger A. Freedman; A. Lewis Ford
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Solved: A falling brick has a mass of 1.5 kg and is moving

Chapter 6, Problem 11DQ

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QUESTION:

Problem 11DQ

A falling brick has a mass of 1.5 kg and is moving straight downward with a speed of 5.0 m/s. A 1.5-kg physics book is sliding across the floor with a speed of 5.0 m/s. A 1.5-kg melon is traveling with a horizontal velocity component 3.0 m/s to the right and a vertical component 4.0 m/s upward. Do all of these objects have the same velocity? Do all of them have the same kinetic energy? For both questions, give your reasoning.

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QUESTION:

Problem 11DQ

A falling brick has a mass of 1.5 kg and is moving straight downward with a speed of 5.0 m/s. A 1.5-kg physics book is sliding across the floor with a speed of 5.0 m/s. A 1.5-kg melon is traveling with a horizontal velocity component 3.0 m/s to the right and a vertical component 4.0 m/s upward. Do all of these objects have the same velocity? Do all of them have the same kinetic energy? For both questions, give your reasoning.

ANSWER:

Solution 11DQ

Step 1:

Velocity of freely falling brick, vbrick = 5 m/s

Mass of freely falling brick, mbrick = 1.5 kg

Kinetic energy, KE = ½ mv2 = ½ × 1.5 kg × 52 m2/s2

KE = ½ × 1.5 kg × 25 m2/s2  = 18.75 J

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