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A man is riding on a flatcar traveling at a constant speed of 9.10 (the figure ). He wishes to throw a ball through a stationary hoop 4.90 above the height of his hands in such a manner that the ball will move horizontally as it passes through the hoop. He throws the ball with a speed of 10.8 with respect to himself.

When the ball leaves the man's hands, what is the direction of its velocity relative to the frame of reference of the flatcar?

When the ball leaves the man's hands, what is the direction of its velocity relative to the frame of reference of an observer standing on the ground?

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