# physics

The speed of an automobile increases from 11 m/s to a speed of 47 m/s over a time period of 9.0 seconds. What is the average rate at which the speed of this car is changing during this time period?

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1. The rate of change in speed is acceleration:

a=(Vf - Vo) / t=(47 - 11) / 9=4m/s^2.

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