Question

An object can have zero average velocity but cannot have zero average speed. Justify.​

Answer 1

Answer:

Velocity has both magnitude and direction while speed only has magnitude. Hence average velocity can be zero if a body travels to point 'A' and back to origin, displacement is 0 so average velocity is also 0. However if body travels same distance to and fro the distance has some value "k"

hope it help u

Answer 2

Velocity has both magnitude and direction while speed only has magnitude.

Hence average velocity can be zero if a body travels to point 'A' and back to origin, displacement is 0 so average velocity is also 0.

However if body travels same distance to and fro the distance has some value "k". So no matter the time taken, average speed will have SOME value but will never be 0.

Average velocity is defined as the ratio of total displacement by TOTAL time taken.

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 .

Where as distance can never be zero for a journey.

Example:

A person completes one revolution in circular path.

Distance = 2 *pi*r

Whereas displacement is zero as source and destination is same.

Hence A body can have zero average velocity but not zero average speed.