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Question
If an object is dropped from the top of a building and it reaches the ground at t = 4 s, then the height of the building is ______
(ignoring air resistance) (g = 9.8 ms–2)
Options
77.3 m
78.4 m
80.5 m
79.2 m
Solution
If an object is dropped from the top of a building and it reaches the ground at t = 4 s, then the height of the building is 78.4 m.
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