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9. The force of buoyancy exerted by the atmosphere on aballoon is B in the upward direction and remainsconstant. The force of air resistance on the balloon actsopposite to the direction of velocity and is proportionalto it. The balloon carries a mass M and is found to falldown near the earth's surface with a constant velocityv. How much mass should be removed from the balloonso that it may rise with a constant velocity v? |
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