## Practice Problems

Work through the odd-numbered problems 1-35. Once you have completed the problem set, check your answers.

### Problems

1. In Fig. 9 , find the location of the number(s) "c" which Rolle's Theorem promises (guarantees).

**Fig. 9**

For problem 3, verify that the hypotheses of Rolle's Theorem are satisfied for each of the functions on the given intervals, and find the value of the number(s) " " which Rolle's Theorem promises exists.

5. Suppose you toss a ball straight up and catch it when it comes down. If is the height of the ball at time , then what does Rolle's Theorem say about the velocity of the ball? Why is it easier to catch a ball which someone
on the ground tosses up to you on a balcony, than for you to be on the ground and catch a ball which someone on a balcony tosses down to you?

7. If , then and but is never equal to . Why doesn't this function violate Rolle's Theorem?

9. If I take off in an airplane, fly around for awhile and land at the same place I took off from, then my starting and stopping heights are the same but the airplane is always moving. Doesn't this violate Rolle's theorem which says there is an instant
when my velocity is ?

11. Use the corollary in problem 10 to justify the conclusion that the only root of is . (Suggestion: What could you conclude about if had another root?)

In problems 13-15, verify that the hypotheses of the Mean Value Theorem are satisfied for each of the functions on the given intervals, and find the value of a number(s) " " which Mean Value Theorem guarantees.

17. If , then and but is never equal to . Why doesn't this function violate the Mean Value Theorem?

In problem 19, you are a traffic court judge. In each case, a speeding ticket has been given and you need to decide if the ticket is appropriate.

19. The driver in the next case heard the toll taker and says, "Your Honor, my average velocity on that portion of the toll road was only 17 miles per hour, so I could not have been speeding. I don't deserve a ticket".

21. Find a function so that and .

23. Find values for and so that the graph of the parabola is

(a) tangent to the line at the point

(b) tangent to the line
at the point

(c) tangent to the parabola at the point

25. Sketch the graphs of several members of the "family" of functions whose derivatives always equal . Give a formula which defines every function in this family.

27. Assume that a rocket is fired from the ground and has the upward velocity shown in Fig. 11. Estimate the height of the rocket when , and seconds.

**Fig. 11**

29. Use the following information to determine an equation for , and .

31. Define to be the **area** bounded by the -axis, the line , and a vertical line at (Fig. 13).

(a) Find a formula for ?

(b) Determine

**Fig. 13**

33. Define to be the **area** bounded by the -axis, the line , and a vertical line at (Fig. 15).

(a) Find a formula for ?

(b) Determine

**Fig. 15**

In problem 35, we have a list of numbers , and the consecutive differences between numbers in the list are

35. If and the difference between consecutive numbers in the list is always 3, find a formula for ?

Source: Dale Hoffman, https://s3.amazonaws.com/saylordotorg-resources/wwwresources/site/wp-content/uploads/2012/12/MA005-4.2-Mean-Value-Theorem.pdf

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