A ball is droped from a high rise platfo...

A ball is droped from a high rise platform `t = 0` starting from rest. After `6 s` another ball is thrown downwards from the same platform with a speed `v`. The two balls meet at `t = 18 s`. What is the value of `v` ?

A

`74m//s`.

B

`64m//s`.

C

`84m//s`.

D

`94m//s`.

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