Respuesta :
Down ... gravity
Up ....... buoyancy
When these are equal, then the balloon either stays at the same altitude,
or moves up or down at a constant rate.
Horizontal ... wind
When wind is not zero, the balloon accelerates in the direction of the wind.
Up ....... buoyancy
When these are equal, then the balloon either stays at the same altitude,
or moves up or down at a constant rate.
Horizontal ... wind
When wind is not zero, the balloon accelerates in the direction of the wind.