Question: 9.If the net work done on a particle is zero, which one of the following statements must be true? (a)The velocity of the particle is

9.If the net work done on a particle is zero, which one of the following statements must be true?
(a)The velocity of the particle is decreased.
(b)The velocity of the particle must be zero.
(c)The speed of the particle is unchanged.
(d)The velocity of the particle is unchanged.

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