Concept explainers
Repeat Example 11(b) and 11(c) for the Burj Khalifa in Dubai, which is the tallest building in the world, standing 2717 it. The initial velocity is –20 ft per second.
(b) Many experiments have shown that when an object is dropped, its acceleration (ignoring air resistance) is constant. This constant has been found to be approximately 32 ft per second every second; that is,
The negative sign is used because the object is falling. Suppose an object is thrown down from the top of the 1100-ft-tall Willis Tower (formerly known as the Sears Tower) in Chicago. If the initial velocity of the object is –20 ft per second, find s(t), the distance of the object from the ground at time t.
(c) Use the equations derived in (b) to find the velocity of the object when it hit the ground and how long it took to strike the ground.
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Finite Mathematics and Calculus with Applications
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