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Q.

The helicopter rises from rest on the ground vertically upwards with a constant acceleration g . A food packet is dropped from the helicopter when it is at a height h. Time taken by the packet to reach the ground is closed to [ g is the acceleration due to gravity]

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a

t=3.4hg

b

t=2h3g

c

t=1.8hg

d

t=23hg

answer is A.

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Detailed Solution

 

Question Image

Packet will have same velocity as that of helicopter when it is dropped.Use Equation of Kinematics between point of drop and ground.-h=2gh  t-12gt2 On  Solving t=2+2hg=3.4hg

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