Question

NEET (Level-11)
20. A stone dropped from the top of a tower is found to
5
travel of the height of the tower during the last
9
second of its fall. The time of fall is
(1) 2 s
(2) 3 s
(3) 4 s
(4) 5 s​

Answer 1

Explanation:

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Answer 2

Answer:

3s

Explanation:

Let the stone taken n second to reach the ground

Given, u=0,a=+g

The distance covered in nth second

9/5 ×distance covered in n seconds

g/2 (2n−1)= 5/9× g/2n^2

⇒18n−9=5n^2⇒5n^2−18n+9=0

so, n=3s or 0.6s

But 0.6s time is practically not possible, hence t=3s