Holt Physics Problem Workbook8

NAME ______________________________________ DATE _______________ CLASS ____________________

1.09 × 10

3

km/h is tested on a flat, hard surface that is 25.0 km long. The

car starts at rest and just reaches a speed of 1.09 × 10

3

km/h when it

passes the 20.0 km mark.

a. If the car’s acceleration is constant, how long does it take to make

the 20.0 km drive?

b. How long will it take the car to decelerate if it goes from its maxi-

mum speed to rest during the remaining 5.00 km stretch?

4. In 1990, Dave Campos of the United States rode a special motorcycle

called the Easyrider at an average speed of 518 km/h. Suppose that at

some point Campos steadily decreases his speed from 100.0 percent to

60.0 percent of his average speed during an interval of 2.00 min. What is

the distance traveled during that time interval?

5. A German stuntman named Martin Blume performed a stunt called “the

wall of death.” To perform it, Blume rode his motorcycle for seven

straight hours on the wall of a large vertical cylinder. His average speed

was 45.0 km/h. Suppose that in a time interval of 30.0 s Blume increases

his speed steadily from 30.0 km/h to 42.0 km/h while circling inside the

cylindrical wall. How far does Blume travel in that time interval?

6. An automobile that set the world record for acceleration increased speed

from rest to 96 km/h in 3.07 s. How far had the car traveled by the time

the final speed was achieved?

7. In a car accident involving a sports car, skid marks as long as 290.0 m

were left by the car as it decelerated to a complete stop. The police report

cited the speed of the car before braking as being “in excess of 100 mph”

(161 km/h). Suppose that it took 10.0 seconds for the car to stop. Esti-

mate the speed of the car before the brakes were applied. (REMINDER:

Answer should read, “speed in excess of . . .”)

8. Col. Joe Kittinger of the United States Air Force crossed the Atlantic

Ocean in nearly 86 hours. The distance he traveled was 5.7 × 10

3

km.

Suppose Col. Kittinger is moving with a constant acceleration during

most of his flight and that his final speed is 10.0 percent greater than his

initial speed. Find the initial speed based on this data.

9. The polar bear is an excellent swimmer, and it spends a large part of its

time in the water. Suppose a polar bear wants to swim from an ice floe to

a particular point on shore where it knows that seals gather. The bear

dives into the water and begins swimming with a speed of 2.60 m/s. By

the time the bear arrives at the shore, its speed has decreased to 2.20 m/s.

If the polar bear’s swim takes exactly 9.00 min and it has a constant de-

celeration, what is the distance traveled by the polar bear?

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