The ball is dropped from a bridge 122.5...

The ball is dropped from a bridge ` 122.5 m` above a river, After the ball has been falling for 2 s, a second ball is thrown straight down after it. What must its initial velocity be so that both hit the water at the same time ?

`40m//s`.

`55.5m//s`.

`26.1m//s`.

`9.6m//s`.

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