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 itu+cmqi-r d10 dhhq ,j6s gondola, of mass M, are in the air and st0rrxmcx cdsftx/6 w6 )h5(y(lationary with respect to the ground. A passenger, of mass m, then climbs l(0xmh5 t (c6x cxrs6rfd/w)y 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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