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Q.

A body dropped from the top of a tower covers a distance 9x in the last second of its journey, where x is the distance covered in 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 C.

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Detailed Solution

Last second →nth second
Question Image
Sn=9xg2(2n−1)=9x
x→ Distance covered in 1st second (or) 1 second.
x=12gt2=g2∴g2(2n−1)=9g22n−2=9,n=5
∴ Time taken to reach the ground is 5 seconds.

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