In which of the following cases the net force is not \( \mathrm{P} ...

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In which of the following cases the net force is not
\( \mathrm{P} \) zero?

W
(1) A kite skillfully held stationary in the sky
(2) A ball freely falling from a height
(3) An aeroplane rising upwards at an angle of \( 45^{\circ} \) with the horizontal with a constant speed
(4) A cork floating on the surface of water
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