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A ball is thrown downwards with a speed ...

A ball is thrown downwards with a speed of `20 m s^(-1)`, from the top of a buling `150 m` high and simultane-ously another ball is throun vertically upwrds wuth a speed of `30 m s^(-1)` from the foot ot the building . Find the time after wguch both the balls will meet. (g=10 m s^(-2))
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