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A balloon is moving vertically upward at a constant speed of 10 m/s. When the balloon is at a certain height h above the ground, a stone is thrown horizontally with a velocity of 6 m/s relative to a person at rest in the basket of the balloon. The stone is observed to hit the ground in 5 s. Find h A. 50 m B. 20 m C. 75 m D. 125 m E. 10 m
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