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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621

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BuyFindarrow_forward

Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621
Textbook Problem

The velocity graph of an accelerating car is shown.

Chapter 5.5, Problem 16E, The velocity graph of an accelerating car is shown. a Use the Midpoint Rule to estimate the average

(a) Use the Midpoint Rule to estimate the average velocity of the car during the first 12 seconds.

(b) what time was the instantaneous velocity equal to the average velocity?

To determine

(a)

To estimate:

The average velocity of a car during the first 12 seconds using the midpoint rule.

Explanation

1) Concept:

Use the mean value theorem for integrals and the midpoint rule to estimate the average velocity of the car.

2) Mean Value Theorem for IntegralsandMidpoint rule:

The Mean Value Theorem: If f is continuous on a,b then there exists a number c in a,b such that

fc=fave=1b-aabfx dx

that is,

abfx dx=fcb-a

The midpoint rule:

abfxdxi=1nfxi- x=x fx1-++fxn-

where x=b-an  and  xi-=12xi-1+xi midpoint of xi-1, xi.

3) Calculation:

By using the mean value theorem for integrals:

Here,a=0 and b=12

The average velocity of the car during the first 12 seconds means the average value of v on 0,12.

vave=112-0012vx dx

vave=112012vx dx

Since we can change the variable in the integration,

vave=112012vtdt

Use themidpoint rule.

With n=3, a=0 and b=12 interval width is

t=b-an

Substitute values.

t=12-03

t=4

The three subintervals are 0,4, 4,8, 8,12

To determine

(b)

To find:

The time where the instantaneous velocity equal to the average velocity

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