Explanation
From given figure, it is clear that the net displacement is zero. So, average velocity will be zero.
Since displacement is always less than or equal to distance, but never greater than distance. Hence, numerical ratio of displacement to the distance covered is always equal to or less than one.
When the body is projected vertically upward then at the highest point its velocity is zero but acceleration is not equal to zero (g = 9.8 m/s2).
Constant velocity means constant speed as well as same direction throughout.
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