(Answered) A person stands on the edge of a roof 490m above the ground

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A person stands on the edge of a roof 490m above the ground and throws a stone horizontally with an initial speed of 15 m/s. Neglecting air resistance. find (a) the time taken by the stone to reach the ground. and (b) the speed with which it hits the ground (g = 9.8 ms-2).

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