A hiker stands on the edge of cliff 490 ...

A hiker stands on the edge of cliff 490 m above the ground and throws a stone horizontally with an initial speed of `15 " m s "^(-1)` Neglecting air resistance , find the time taken by the stone to reach the ground , and the speed with which it hits the ground . (Take `g=9.8 " m s"^(2))`.

`15ms^(-1)`

`98ms^(-1)`

`99ms^(-1)`

`90ms^(-1)`

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