Question

a body can have zero average velocity but not zero average speed.Why?
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Answer 1

Answer:

Average speed is the ratio of total distance by TOTAL time taken. As average velocity depends on displacement and displacement can be zero if the object returns to initial position . ... Whereas displacement is zero as source and destination is same. Hence A body can have zero average velocity but not zero average speed.

Answer 2

Answer:

body can have zero avg velocity as displacement is zero but in that case it is not necessary that distance must be zero

for e.g. a body is moving in a circular orbit here displacement is zero whereas distance is equal to no. of revolutions*2πr