A stone is thrown vertically upwards from a point that is 12 m above the sea. It then falls into the sea below after 3.4 s.
Air resistance is negligible.
At which speed was the stone released when it was thrown?
1 )
$3.5m{s^{ - 1}}$
2 )
$6.6m{s^{ - 1}}$
$13m{s^{ - 1}}$
4 )
$20m{s^{ - 1}}$
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