2.02: Speed Problems

How far did Karen and her mother travel during the second hour of the trip? (2 points)

a. 0 miles

Identify the time period(s) during the trip when the car was traveling at the greatest average speed. (2 points)

a. first hour

What is the average speed of the car during the first two hours of the trip? (2 points)

b. 20 miles per hour

What is the average speed of the car for the first three hours of the trip? (2 points)

b. 20 miles per hour

Identify the time period(s) during the trip when the car was stopped. (2 points)

b. second and fifth hour

If Karen and her mother take three hours to come home, calculate the average speed of the car for the trip home. (2 points)

c. 25 miles per hour

Study the graph shown below. It is a graphic of a car trip taken by Karen and her mother. The starting position (0,0) is their home. How far from the home did Karen and her mother travel during the first hour of the trip? (2 points)

c. 40 miles

What is the average speed of the car during the first hour of the trip? (2 points)

c. 40 miles per hour

Every year, new records in track and field events are recorded. Let's take a historic look back at some exciting races. On August 20, 1989, in Cologne, West Germany, Said Aouita of Morocco also established a world record when he ran the 3000. m run in 7 minutes, 29.45 seconds. What was his average speed (in m/s) for the race? Remember to include your data, equation, and work when solving this problem. (5 points)

v = d/t t = 7 min and 29.45 sec OR: 7(60) + 29.45 = 449.45 seconds d = 3,000m v =? v = 3,000m/449.45s (divide) v = 6.674824786 v = 6.675 m/s

Every year, new records in track and field events are recorded. Let's take a historic look back at some exciting races. In 1989, Carl Lewis established a world record when he ran the 100. meter dash in 9.92 seconds. What was his average speed (in m/s) for the race? Remember to include your data, equation, and work when solving this problem. (5 points)

v = d/t t = 9.92 seconds d = 100m v = ? v = 100m/9.92s (divide) v = 10.08064516 m/s v = 10.1 m/s