A man hangs from a rope attached to a ho...

A man hangs from a rope attached to a hot-air balloon. The mass of the man is greater than the mass of the balloon and its constents. The system is stationary in air. If the man now clims up to the balloon using the rope, the centre of mass of the man plus balloon system will

remain stationary

move up

move down

first move up and then return to its intial position

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