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Question

A ball dropped from the top of a building strikes ground with a speed of 40 m/s. The height of building is approximately (neglect air resistance)
  1. 40 m
  2. 80 m
  3. 40 m
  4. 80 m


Solution

The correct option is B 80 m
v=2gh
h = v22g = 40×4020 = 80 m  

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