18. In which of the following is acceleration zero?
I. If a car gains speed.
II. If a car reduces its speed.
III. If a car changes its direction.
IV. If a car has constant velocity.
A. I and Il only B.Ill only C.IV only
D. III and IV
I. If a car gains speed.
II. If a car reduces its speed.
III. If a car changes its direction.
IV. If a car has constant velocity.
A. I and Il only B.Ill only C.IV only
D. III and IV
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Answer:
C. IV only
Explanation:
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