本题目来源于试卷: gc textbook chapter 7 Linear Momentum，类别为 通用国际物理
[问答题]
A helium balloon and zpergp19j+ha)y (yk 7it,riv df6y+t4jecd 2;a sqt1,bs gondola, of mass M, are in the air and stationary with respect to t21rf+yatd b,6 veq,is4 jdct;he ground. A passenger, of mass m, then climbs out and slides down a rope with speed measured with respect to the balloon. With what speed and direction (relative to Earth) does the balloon then move? What happens if the passenger stops?
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