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Q.

A hydrogen balloon released on the moon from a height will

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a

move up with acceleration 9.8 ms-2

b

move down with acceleration 9.8 ms-2

c

move down with acceleration 9.86ms2

d

neither move up nor move down

answer is C.

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Detailed Solution

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As there will not be any atmosphere( hence no buoyant force) , the only force acting on the body will be the gravitational force. 

So the balloon will move downwards with a acceleration of 9.86ms-2.

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