In which of the following cases the net force is not zero?

A kite skillfully held stationary in the sky

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A ball freely falling from a height

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An airplane rising upwards at an angle of 45 degree with the horizontal with a constant speed

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A cork floating on the surface of water

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Solution

The correct option is B A ball freely falling from a height
If a ball freely falls from a height, then it will accelerate with an acceleration of $g$
Therefore force acting on it is not zero
In remaining options, the net acceleration is $0$ . So there is not net force
Therefore option $B$ is correct.

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Similar questions

Q. In which of the following cases , the net force is zero?
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II) A cork floating on the surface of water
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