The three forces acting on a hot-air balloon that is moving vertically are its weight, the force due to air resistance and the upthrust force.
The hot-air balloon descends vertically at constant speed. The force of air resistance on the balloon is F.
Which weight of material must be released from the balloon so that it ascends vertically at the same constant speed?
1 )
F
2F
3 )
3F
4 )
4
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