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a
climb up with an acceleration of 9.8 m/sec2
b
climb up with an acceleration of 9.8 x 6 m/sec2
c
neither climb nor fall
d
fall with an acceleration of (9 .8/6) m/sec2
answer is D.
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Detailed Solution
Upthrust force = volume ×density×g On moon surface g is decrease that is one sixth of the g on earth surface so upthrust force decrease there fore balloon on moon surface falls with an acceleration g/6 so option 4 is correct