Question: Use the information in Example 7 to find the average speed of the car from t1 = 0 to t2 = 9 seconds. Explain why

Use the information in Example 7 to find the average speed of the car from t1 = 0 to t2 = 9 seconds. Explain why the result is less than the value obtained in part(b) of Example7.
Refer to Example 7:
The distance s (in feet) a moving car is from a stoplight is given by the function
s(t) = 20t3/2
Where t is the time (in seconds). Find the average speed of the car (a) from t1 = 0 to t2 = 4 seconds and (b) from t1 = 4 to t2 = 9 seconds.

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