A rock is dropped from the top of a 45-meter tower, and at the same time a ball is thrown from the top of the
tower in a horizontal direction. Air resistance is negligible. The ball and the rock hit the level ground a
distance of 30 meters apart. The horizontal velocity of the ball thrown was most nearly
(A) 5 m/s (B) 10 m/s (C) 14.1 m/s (D) 20 m/s (E) 28.3 m/s
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THE ANSWER IS B)10m/s....
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