Aball is thrown vertically upward. what is its acceleration right before it hits the earth?

The entire time the ball is in the air, its acceleration is 9.8 m/s2 down provided this occurs on the surface of the Earth. Note that the acceleration can be either 9.8 m/s2 or -9.8 m/s2.
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It's true it didin't work becouse britain continued trading with it's colonies and the system hurt economies of the countries that used it

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