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A ball is thrown downwards with a speed ...

A ball is thrown downwards with a speed of `20 m s^(-1)`, from the top of a building `150 m` high and simultaneously another ball is thrown vertically upwards with a speed of `30 m s^(-1)` from the foot to the building . Find the time after which both the balls will meet. (g=10 m s^(-2))
.

A

4s

B

3s

C

1s

D

5s

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