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Q.

Water drops are falling at a regular interval of time from a certain height H above the ground. At the instant the fourth drop is released, the first one just reaches the ground. The height of the third drop from the ground is

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a

H4

b

3H4

c

8H9

d

H9

answer is C.

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Detailed Solution

Let the time interval be t then H=12g(3t)2⇒12g(t)2=H9

The height of 3rd drop from the ground is =H−12g(t)2=H−H9=8H9

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