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 its gondola, of massbf8)n,e(0e f0 tfvbhlq k afl81;7ky iuw;h:x2yci,2zc -fhx7d/ joh M, are in the air and stationary with respect to the ground. A passenger, of mass m, then climbs out and slides down a rope with speedfj:ou xhc2,hwcyh;x7-i2d /z 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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