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subho123
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Homework Statement
It says that "a man of mass m is standing on a ladder attached to the rope of a balloon of mass M (weight of the ladder and rope can be neglected). The balloon is in a static position. Now the man starts moving upwards through the ladder with a velocity v with respect to the balloon. Now what will be the velocity of the balloon ?"
Homework Equations
Now if the velocity of the balloon and the man with respect to the ground be u and V respectively, then we can say
V - u = v
V = u + v
now if we use the conservation of mementum, then
Mu + m(u + v) = 0
(M+m)u = - mv
u = - mv/(M+m)
Is it right ? This indicates that the balloon will go downwards !