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Q: If a stone falls past a bird on a ledge moving at 4 m/s, how fast will the stone be moving just before it hits the ground below 9 seconds later? A. 92.2 m/s C. 352.8 m/s B. 48.2 m/s D. 36 m/s
A: It will take 92.2 m/s for the stone be moving just before it hits the ground below 9 seconds later. Solution: u=4 m/s, t = 9 s v = u + gt or, v = 4 + 9.8 * 9 = 4 + 88.2 = 92.2 m/s
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