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Q.

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

4s

b

5s

c

3s

d

6s

answer is B.

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Detailed Solution

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 Given 7x=g2(2n−1) and x=12g(1)2 Solving these two equations, we get n=4s. 

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