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The car is slowing down at a rate of 10 miles per hour for each hour it continues this rate.
You can't because m/s^(2) is acceleration and mph/s is not squared and at best is velocity 'mph/s could be written as 'miles / (hours X Secs) , which is a nonsense.
There is no acceleration if the car is travelling at a steady 54,000 miles per hour.
1.37822e6 miles per hour.
If its speed is constant, its acceleration is nil.