In which of the following cases , the net force is zero? I) A ball freely falling from a certain height II) A cork floating on the surface of water III) An object floating in air
I and II only
II and III only
III and I only
I, II and III
A
I and II only
B
II and III only
C
III and I only
D
I, II and III
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Solution
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In first case gravity is there so net fore is not zero? while in others it is balanced by buoyancy of air and liquid. so net force is zero in II, III case so Ans is (B).
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