What is the velocity of the ball - magnitude and direction, Physics

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A boy is standing on an elevator which is travelling downward with constant velocity of 30 meters per second. 

The boy throws a ball vertically upward with velocity of 10 meters per second relative to the elevator.  What is the velocity of the ball, MAGNITUDE AND DIRECTION, relative to the elevator shaft the immediate the boy releases theball?

20 metre/sec


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