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Question

If the net force on a hot-air balloon is directed straight upward, which way does the acceleration point?

A
Downward only if the balloon if falling
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B
Upward only if the balloon is rising
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C
Upward and in the downward direction
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D
Upward
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E
None of the above: a hot air balloon floats in the atmosphere with zero acceleration.
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Solution

The correct option is B Upward only if the balloon is rising

Given,

Direction of acceleration of balloon is upward.

Force = mass x acceleration

F=ma

Direction of acceleration is toward the net force.

Hence, direction of net force is upward if balloon is rising.


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