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The speed time graph shows the motion of a car over a period of 40 seconds.

a. describe the motion of the car between:

1.) O and A - The car is traveling at constant speed from 0 to 20 m/s.
2.) A and B - The car is at rest for 20 seconds.
3.) B and C - The car is decelerating at 20 m/s.

b. Calculate the acceleration of the car.
c. Calculate the distance the car traveled at constant speed.
d. What is the average speed of the car for the whole journey?

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