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The acceleration of the balloon and its instruments at the Earth’s surface as it is released is 27 m s−2.
The density of the air at the Earth's surface is 1.3 kg m−3.
Calculate the total mass M of the helium-filled balloon and its load
F=mg-pVg (weight-upthrust)
You can form an expression for m by using these equations (presuming you calculated V)

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