A body dropped from the top of a tower covers a distance 7x in the last second of its journey, where x is the distance covered in the first second. How much time does it take to reach the ground?
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a
3s
b
4s
c
5s
d
6s
answer is B.
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Detailed Solution
Given 7x=g2(2n−1) and x=12g(1)2 Solving these two equations, we get n=4s.