A body dropped from a height h with an i...

A body dropped from a height h with an initial speed zero, strikes the ground with a velocity `3km/h`. Another body of same mass is dropped from the same height h with an initial speed `-u' = 4km//h`. Find the final velocity of second body with which it strikes the ground

`5km//s`

`12km//s`

`3km//s`

`4km//s`

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