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Q.

A balloon is moving vertically up with a velocity 4 m/s. When it is at a height h, a body is gently released from it. If it reaches ground in 4 sec, the height of balloon, when the body is released, is: (take g = 9.8 m/s2)

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a

82.2 m

b

62.4 m

c

42.4 m

d

78.4 m

answer is A.

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Detailed Solution

Question Image

By using s=ut+12at2
-h=4(4)+12-9.842
h = 62.4m

 

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