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25. An arrow is shot from the top of a castle wall at a speed of 15 m/s at an angle of 150 below the

25. An arrow is shot from the top of a castle wall at a speed of 15 m/s at an angle of 150 below the horizontal, and hits the ground with a speed of 28 m/s. Calculate the height of the wall. (ans: 28.5 m)

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