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

`3 km//h`

`4km/h`

`5km//h`

`12 km//h`

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