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A ball is thrown downwards with a speed ...

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

A

4s

B

3s

C

1s

D

5s

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