A ball A is dropped from a cliff 45m high.Two seconds later,another ball B is thrown downwards from the same place with some initial speed.Both of them reach the ground together.Find the dpeed with which the ball was thrown?

A ball A is dropped from a cliff 45m high.Two seconds later,another ball B is thrown downwards from the same place with some initial speed.Both of them reach the ground together.Find the dpeed with which the ball was thrown?

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