[" A stone is dropped from the top of bu...

[" A stone is dropped from the top of building and at the same time a second stone is "],[" thrown vertically upward from the bottom of the building with a speed of "20ms^(-1)" ."],[" They pass each other "3" seconds later."],[" Find the height of the building."]

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[" A stone is dropped from the top of building and at the same time a second stone is "],[" thrown vertically upward from the bottom of the building with a speed of "20ms^(-1)" ."],[" They pass each other "3" seconds later."],[" Find the height of the building."]

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