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The force which keeps a hot air balloon ...

The force which keeps a hot air balloon is the buoyant force F. Suppose a hot air balloon ofmass M has a downward acceleration of magnitude a.Find the ballast mass that must be dropped from it to cause the balloon to accelerate upward with same magnitude a.'

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The correct Answer is:
`[(2Ma)/(g+a)]`
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PHYSICS GALAXY - ASHISH ARORA-NEWTONS LAWS OF MOTION-Unsolved Numerical Problem
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