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Hot-Air Balloon A hot-air balloon of mass M is descending vertically with downward acceleration of magnitude...

Hot-Air Balloon A hot-air balloon of mass M is descending vertically with downward acceleration of magnitude a. How much mass (ballast) must be thrown out to give the balloon an upward acceleration of magnitude a (same magnitude but opposite direction)? Assume that the upward force from the air (the lift) does not change because of the decrease in mass. (Use any variable or symbol stated above along with the following as necessary: g.)

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