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An orange fruit drops to the ground from the top of a tree 45m tall....

Physics
WAEC 1991
An orange fruit drops to the ground from the top of a tree 45m tall. How long does it takes to reach the ground? (g = 10ms-2)
  • A. 3.0s
  • B. 4.5s
  • C. 6.0s
  • D. 7.5s
  • E. 9.0s
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Correct Answer: Option A
Explanation
s = ut + \(\frac{1}{2}gt^2\)

45 = 0 + 5t2

t = 3s
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