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A ball is dropped from a high rise platf...

A ball is dropped from a high rise platform at `t=0` starting from rest. After `6s`, another ball is thrwon downwards from the same platform with a speed v. The two balls meet at `t = 18s`. What is the value of v?
(Take `g = 10 ms^(-2)`)

A

`60 m//s`

B

`75m//s`

C

`55m//s`

D

`40m//s`

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The correct Answer is:
B
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