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Buoyant force acting on a ballon

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A balloon is descending with a constant acceleration "a" less than 'g' weight of the balloon with the basket and the contents is W. What weight m of the basket should be released so that the balloon will begin to accelerate upwards with constant acceleration 'a' ? Neglect air resistance.

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Let the upward thrust on the balloon (buoyant force) be F.

W - F = (W/g)a ........(1)

(W-F is the net force on the balloon; now it is ...

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