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Question

In which of the following cases the net force is not equal to zero?
  1. A kite skillfully held stationary in the sky.
  2. A ball falling freely from a height.
  3. A helicopter hovering above the ground.
  4. A cork floating on the surface of water.

A
A kite skillfully held stationary in the sky.
B
A ball falling freely from a height.
C
A helicopter hovering above the ground.
D
A cork floating on the surface of water.
Solution
Verified by Toppr

As ball is falling freely that means weight of ball is acting on it hence net force is not zero and in all other cases things are stationary so net force on them is zero.

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