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The graph below shows the position of a race car as it tests out a new engine.

a. What is the distance traveled by the car between 1 and 9 seconds?

b. What is the average speed of the car between 1 and 9 seconds? (Answer in km/s)

c. Describe how the speed of the car changes throughout its test run.

d. If you had a graph of velocity versus time for this test, what would be the total area under the curve?

The graph below shows the position of a race car as it tests out a new engine a What is the distance traveled by the car between 1 and 9 seconds b What is the a class=

Respuesta :

AL2006

Average speed = distance/time

From 1 to 9 seconds:

Distance covered = 1 - 0.2 = 0.8 km

Time = 9 - 1 = 8 sec

Average speed = 0.8 km / 8 sec

Average speed = 0.1 km/s .

The average speed for the whole test is 1.6 km / 20 sec = 0.08 km/sec. A graph of speed vs time would average out as a horizontal line at 0.08 km/sec from 1 sec to 21 sec. The area under it would be (0.08 km/s) x (20 sec) = 1.6 km.

Surprise surprise ! The area under a speed/time graph is the distance covered during that time !

In closing, I want to express my gratitude for the gracious bounty of 3 points with which I have been showered. Moreover, the green breadcrust and tepid cloudy water have also been refreshing.

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