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Physics / University Physics 13 / Chapter 2 / Problem 42E

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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A brick is dropped (zero initial speed) from the roof of a

Chapter 2, Problem 42E

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QUESTION:

A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 2.50 s. You may ignore air resistance, so the brick is in free fall. (a) How tall, in meters, is the building? (b) What is the magnitude of the brick’s velocity just before it reaches the ground? (c) Sketch ?ay???t?, ?vy???t?, and ?y???t graphs for the motion of the brick.

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QUESTION:

A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 2.50 s. You may ignore air resistance, so the brick is in free fall. (a) How tall, in meters, is the building? (b) What is the magnitude of the brick’s velocity just before it reaches the ground? (c) Sketch ?ay???t?, ?vy???t?, and ?y???t graphs for the motion of the brick.

ANSWER:

Solution 42E (a).How tall the building in meter is given by 2 s = ut + 1/2 gt When u = o,g is acceleration due to gravity. s = 1/2 (9.8 m/s )(2.50 s) 2 s = 30.625 m. (b).Magnitude of b

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