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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

6 Sec

b

3 Sec

c

5 Sec

d

4 Sec

answer is B.

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Detailed Solution

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7x=g2(2n-1) and x=12g(1)2.

Solving, n = 4 Sec

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