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Ch. 6 - Applications of Integration
Briggs - Calculus: Early Transcendentals 3rd Edition
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Not the one you use?Change textbook
All textbooksBriggs 3rd EditionCh. 6 - Applications of IntegrationProblem 6.R.12a
Chapter 6, Problem 6.R.12a

{Use of Tech} Decreasing velocity A projectile is fired upward, and its velocity (in m/s) is given by v(t) = 200 / √t+1, for t≥0.
a. Graph the velocity function, for t≥0.

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Understand the function: The velocity function given is v(t) = 200 / √(t+1). This represents how the velocity of the projectile changes over time, t, where t is greater than or equal to 0.
Identify the domain: Since the function involves a square root, ensure that the expression inside the square root is non-negative. Here, t+1 is always positive for t ≥ 0, so the domain is t ≥ 0.
Consider the behavior of the function: As t increases, the denominator √(t+1) increases, which means the overall value of v(t) decreases. This indicates that the velocity decreases as time progresses.
Graph the function: To graph v(t), plot points for various values of t starting from t = 0. Calculate v(t) for these values to get a sense of the curve. For example, at t = 0, v(0) = 200 / √(0+1) = 200. As t increases, compute v(t) for t = 1, 2, 3, etc., to see how the velocity decreases.
Analyze the graph: Observe that the graph starts at v(0) = 200 and decreases as t increases. The graph will be a curve that approaches the t-axis but never touches it, reflecting the decreasing velocity over time.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Velocity Function

The velocity function describes the rate of change of an object's position with respect to time. In this case, the function v(t) = 200 / √(t+1) indicates how the velocity of the projectile changes as time progresses. Understanding this function is crucial for analyzing the motion of the projectile and determining its behavior over time.
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Derivatives Applied To Velocity

Graphing Functions

Graphing a function involves plotting its values on a coordinate system to visualize its behavior. For the velocity function v(t), this means calculating v(t) for various values of t and plotting these points to observe how velocity changes as time increases. This graphical representation helps in understanding trends, such as whether the velocity is increasing or decreasing.
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Graph of Sine and Cosine Function

Limits and Asymptotic Behavior

Limits are fundamental in calculus for understanding the behavior of functions as they approach specific points or infinity. In the context of the velocity function, analyzing limits can reveal how the velocity behaves as time t increases indefinitely. This concept is essential for predicting long-term behavior and understanding the implications of decreasing velocity in projectile motion.
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Related Practice
Textbook Question

Surface area and volume Let f(x) = 1/3 x³ and let R be the region bounded by the graph of f and the x-axis on the interval [0, 2].


c. Find the volume of the solid generated when R is revolved about the x-axis.

Textbook Question

43–55. Volumes of solids Choose the general slicing method, the disk/washer method, or the shell method to answer the following questions.


The region bounded by the curves y = sec x and y=2, for 0 ≤ x ≤ π/3, is revolved about the x-axis. What is the volume of the solid that is generated? 

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Textbook Question

43–55. Volumes of solids Choose the general slicing method, the disk/washer method, or the shell method to answer the following questions.


What is the volume of the solid whose base is the region in the first quadrant bounded by y = √x,y = 2-x, and the x-axis, and whose cross sections perpendicular to the base and parallel to the y-axis are semicircles?

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Textbook Question

Position, displacement, and distance A projectile is launched vertically from the ground at t=0, and its velocity in flight (in m/s) is given by v(t)=20−10t. Find the position, displacement, and distance traveled after t seconds, for 0≤t≤4.

Textbook Question

82–84. Fluid Forces Suppose the following plates are placed on a vertical wall so that the top of the plate is 2 m below the surface of a pool that is filled with water. Compute the force on each plate.


A circular plate with a radius of 2 m

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Textbook Question

14–25. {Use of Tech} Areas of regions Determine the area of the given region.


The region bounded by y = ln x,y = 1, and x = 1

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