일반물리학 1 · Force and Motion-I · Problem 61
일반물리학 1 — Force and Motion-I: Problem 61
61 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? Assume that the upward force from the air (the lift) does not change because of the decrease in mass.
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