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Sagot :
To find the average velocity of an object moving along a line given by the function [tex]\( s(t) = -172 + 102t \)[/tex] over various intervals, follow these steps:
### Interval [1, 8]
First, calculate the average velocity over the interval [1, 8].
Step 1: Identify the position function [tex]\( s(t) \)[/tex].
[tex]\[ s(t) = -172 + 102t \][/tex]
Step 2: Evaluate the position at the beginning and end of the time interval.
- For [tex]\( t = 1 \)[/tex]:
[tex]\[ s(1) = -172 + 102 \cdot 1 = -172 + 102 = -70 \][/tex]
- For [tex]\( t = 8 \)[/tex]:
[tex]\[ s(8) = -172 + 102 \cdot 8 = -172 + 816 = 644 \][/tex]
Step 3: Compute the change in position [tex]\(\Delta s\)[/tex].
[tex]\[ \Delta s = s(8) - s(1) = 644 - (-70) = 644 + 70 = 714 \][/tex]
Step 4: Compute the change in time [tex]\(\Delta t\)[/tex].
[tex]\[ \Delta t = 8 - 1 = 7 \][/tex]
Step 5: Calculate the average velocity [tex]\(\bar{v}\)[/tex].
[tex]\[ \bar{v} = \frac{\Delta s}{\Delta t} = \frac{714}{7} = 102 \][/tex]
Therefore, the average velocity of the object over the interval [tex]\([1, 8]\)[/tex] is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
### Interval [1, 7]
Repeat the steps for the interval [1, 7]:
Step 1: Evaluate the position at [tex]\( t = 1 \)[/tex] and [tex]\( t = 7 \)[/tex].
- For [tex]\( t = 1 \)[/tex]:
[tex]\[ s(1) = -172 + 102 = -70 \][/tex]
- For [tex]\( t = 7 \)[/tex]:
[tex]\[ s(7) = -172 + 714 = 542 \][/tex]
Step 2: Compute [tex]\(\Delta s\)[/tex].
[tex]\[ \Delta s = s(7) - s(1) = 542 - (-70) = 542 + 70 = 612 \][/tex]
Step 3: Compute [tex]\(\Delta t\)[/tex].
[tex]\[ \Delta t = 7 - 1 = 6 \][/tex]
Step 4: Calculate the average velocity.
[tex]\[ \bar{v} = \frac{\Delta s}{\Delta t} = \frac{612}{6} = 102 \][/tex]
Therefore, the average velocity over the interval [tex]\([1, 7]\)[/tex] is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
### Interval [1, 6]
Repeat the process for the interval [1, 6]:
Step 1: Evaluate the position at [tex]\( t = 1 \)[/tex] and [tex]\( t = 6 \)[/tex].
- For [tex]\( t = 1 \)[/tex]:
[tex]\[ s(1) = -70 \][/tex]
- For [tex]\( t = 6 \)[/tex]:
[tex]\[ s(6) = -172 + 612 = 440 \][/tex]
Step 2: Compute [tex]\(\Delta s\)[/tex].
[tex]\[ \Delta s = s(6) - s(1) = 440 - (-70) = 440 + 70 = 510 \][/tex]
Step 3: Compute [tex]\(\Delta t\)[/tex].
[tex]\[ \Delta t = 6 - 1 = 5 \][/tex]
Step 4: Calculate the average velocity.
[tex]\[ \bar{v} = \frac{\Delta s}{\Delta t} = \frac{510}{5} = 102 \][/tex]
Therefore, the average velocity over the interval [tex]\([1, 6]\)[/tex] is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
### Interval [1, 1+h], where [tex]\( h > 0 \)[/tex]
For the general interval [tex]\([1, 1 + h]\)[/tex]:
Step 1: Evaluate the position at [tex]\( t = 1 \)[/tex] and [tex]\( t = 1 + h \)[/tex].
- For [tex]\( t = 1 \)[/tex]:
[tex]\[ s(1) = -70 \][/tex]
- For [tex]\( t = 1 + h \)[/tex]:
[tex]\[ s(1 + h) = -172 + 102(1 + h) = -172 + 102 + 102h = -70 + 102h \][/tex]
Step 2: Compute [tex]\(\Delta s\)[/tex].
[tex]\[ \Delta s = s(1 + h) - s(1) = (-70 + 102h) - (-70) = 102h \][/tex]
Step 3: Compute [tex]\(\Delta t\)[/tex].
[tex]\[ \Delta t = (1 + h) - 1 = h \][/tex]
Step 4: Calculate the average velocity.
[tex]\[ \bar{v} = \frac{\Delta s}{\Delta t} = \frac{102h}{h} = 102 \][/tex]
Therefore, the average velocity over the interval [tex]\([1, 1 + h]\)[/tex] is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
In summary, for all given intervals, the average velocity of the object is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
### Interval [1, 8]
First, calculate the average velocity over the interval [1, 8].
Step 1: Identify the position function [tex]\( s(t) \)[/tex].
[tex]\[ s(t) = -172 + 102t \][/tex]
Step 2: Evaluate the position at the beginning and end of the time interval.
- For [tex]\( t = 1 \)[/tex]:
[tex]\[ s(1) = -172 + 102 \cdot 1 = -172 + 102 = -70 \][/tex]
- For [tex]\( t = 8 \)[/tex]:
[tex]\[ s(8) = -172 + 102 \cdot 8 = -172 + 816 = 644 \][/tex]
Step 3: Compute the change in position [tex]\(\Delta s\)[/tex].
[tex]\[ \Delta s = s(8) - s(1) = 644 - (-70) = 644 + 70 = 714 \][/tex]
Step 4: Compute the change in time [tex]\(\Delta t\)[/tex].
[tex]\[ \Delta t = 8 - 1 = 7 \][/tex]
Step 5: Calculate the average velocity [tex]\(\bar{v}\)[/tex].
[tex]\[ \bar{v} = \frac{\Delta s}{\Delta t} = \frac{714}{7} = 102 \][/tex]
Therefore, the average velocity of the object over the interval [tex]\([1, 8]\)[/tex] is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
### Interval [1, 7]
Repeat the steps for the interval [1, 7]:
Step 1: Evaluate the position at [tex]\( t = 1 \)[/tex] and [tex]\( t = 7 \)[/tex].
- For [tex]\( t = 1 \)[/tex]:
[tex]\[ s(1) = -172 + 102 = -70 \][/tex]
- For [tex]\( t = 7 \)[/tex]:
[tex]\[ s(7) = -172 + 714 = 542 \][/tex]
Step 2: Compute [tex]\(\Delta s\)[/tex].
[tex]\[ \Delta s = s(7) - s(1) = 542 - (-70) = 542 + 70 = 612 \][/tex]
Step 3: Compute [tex]\(\Delta t\)[/tex].
[tex]\[ \Delta t = 7 - 1 = 6 \][/tex]
Step 4: Calculate the average velocity.
[tex]\[ \bar{v} = \frac{\Delta s}{\Delta t} = \frac{612}{6} = 102 \][/tex]
Therefore, the average velocity over the interval [tex]\([1, 7]\)[/tex] is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
### Interval [1, 6]
Repeat the process for the interval [1, 6]:
Step 1: Evaluate the position at [tex]\( t = 1 \)[/tex] and [tex]\( t = 6 \)[/tex].
- For [tex]\( t = 1 \)[/tex]:
[tex]\[ s(1) = -70 \][/tex]
- For [tex]\( t = 6 \)[/tex]:
[tex]\[ s(6) = -172 + 612 = 440 \][/tex]
Step 2: Compute [tex]\(\Delta s\)[/tex].
[tex]\[ \Delta s = s(6) - s(1) = 440 - (-70) = 440 + 70 = 510 \][/tex]
Step 3: Compute [tex]\(\Delta t\)[/tex].
[tex]\[ \Delta t = 6 - 1 = 5 \][/tex]
Step 4: Calculate the average velocity.
[tex]\[ \bar{v} = \frac{\Delta s}{\Delta t} = \frac{510}{5} = 102 \][/tex]
Therefore, the average velocity over the interval [tex]\([1, 6]\)[/tex] is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
### Interval [1, 1+h], where [tex]\( h > 0 \)[/tex]
For the general interval [tex]\([1, 1 + h]\)[/tex]:
Step 1: Evaluate the position at [tex]\( t = 1 \)[/tex] and [tex]\( t = 1 + h \)[/tex].
- For [tex]\( t = 1 \)[/tex]:
[tex]\[ s(1) = -70 \][/tex]
- For [tex]\( t = 1 + h \)[/tex]:
[tex]\[ s(1 + h) = -172 + 102(1 + h) = -172 + 102 + 102h = -70 + 102h \][/tex]
Step 2: Compute [tex]\(\Delta s\)[/tex].
[tex]\[ \Delta s = s(1 + h) - s(1) = (-70 + 102h) - (-70) = 102h \][/tex]
Step 3: Compute [tex]\(\Delta t\)[/tex].
[tex]\[ \Delta t = (1 + h) - 1 = h \][/tex]
Step 4: Calculate the average velocity.
[tex]\[ \bar{v} = \frac{\Delta s}{\Delta t} = \frac{102h}{h} = 102 \][/tex]
Therefore, the average velocity over the interval [tex]\([1, 1 + h]\)[/tex] is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
In summary, for all given intervals, the average velocity of the object is [tex]\( 102 \, \text{units of distance per unit time} \)[/tex].
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