a balloon with mass m is descending down with an acceleration a. what mass m of its must be remove so that it start moving up with acceleration a?
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Take upward direction to be the positive y-direction. If m is the mass thrown out, then the equation of motion for before and after the mass m is thrown out are
Ma = F – Mg
(M–m)a = F – (M–m)g
Solving the two equations m =2ma/(a+g)
Ma = F – Mg
(M–m)a = F – (M–m)g
Solving the two equations m =2ma/(a+g)
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