A balloon of volume V = 20 m3 filled with helium rose to a height h = 180 m in time t = 0.5 min. Mass of the ball with equipment and basket M = 12 kg. Find the mass of the load lifted by the ball. The densities of air and helium up to a height of 180 m are considered constant: pv = 1.29 kg/m3, pg = 0.18 kg/m3.

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