本题目来源于试卷: Linear Momentum，类别为 IB物理学
[问答题]
A helium balloon and its gondola, of mass M, are in the air an5ch:xoswe as) 52kdt6:li*pnd stationaryj 5n u tzr9.cjp7r0l q2*) bfi*q*iwtikbuq8/ with respect to the ground. A passenger, of mass m, then climbs out and slides do. *b) qbqi/kufjur q pn570 wi*zctjtl9r8i*2wn 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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