Question

A body can have zero average velocity but not zero average speed.Why?

Answer 1

Answer:

Velocity can be zero but not speed because :

Velocity :

It is defined as the rate of change of displacement per unit time .

Speed :

It is defined as the rate of change of distance per unit time

$\huge\bold\pink{Displacement}$

It is the minimum distance between two points .

♥See attachement

$\huge\bold\pink{Distance}$

It is the actual length between two points .

d1 is displacement in attachement which is with red line

d2 is distance with blue line

☯☯☯☯☯☯☯☯☯☯☯❓❓❓❓❓

Now when the average velocity is zero ❓❓❓❓

when the object is travelling in circular path and the initial and final position is same.

Then If object start from one point and stop after a round on that points again then the distance travelled has some magnitude because it is actual distance between two points .

But displacement become zero because the minimum distance between two points is zero ( the object again reach at the same points )

See attachement 2

♥♥

The displacement is zero So velocity also zero

Thanks !!

Answer 2

$<font color = "green"><marquee > hi mate......!!!!</font color = "green"></marquee>$

☢️average velocity:-

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

☢️average speed:-

➡️Average speed is the ratio of total distance by TOTAL time taken.⚡⚡

your answer:-

➡️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.⚡⚡

$<font color = "green"><marquee > hope this helps</font color = "green"></marquee>$

$<font color = "green"><marquee > ☢️phenomenal jat</font color = "green"></marquee>$

$<font color = "green"><marquee > #RJ 18 aale</font color = "green"></marquee>$