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7. A ball A is thrown vertically upwards at 25 ms-1 from a point P. Three seconds later a second ball B is also thrown

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7. A ball A is thrown vertically upwards at 25 ms-1 from a point P. Three seconds later a second ball B is also thrown vertically upwards from the point P at 25 ms-1. Taking the acceleration due to gravity to be 10 ms-2, calculate (a) the time for which ball A has been in motion when the balls meet [6] (b) the height above P at which A and B meet. [2]

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