Question about time when object velocity is zero

[technofreak]

Hi,

Suppose we throw an object vertically from a starting point A, and it took five seconds to reach a zero velocity at point B. Of course it will take another five seconds to descend and reach its starting point A.

Can we say that the time duration through which the object velocity was zero at point B is equal to zero seconds. ? And if not, how is this time calculated?

 

[abaidullah]

Is it zero time

we cannot say that the time at pt B is zero ... its very small and can be compared to zero ... but still we cannot this that the time is zero.

 

[halls]

Re: Is it zero time

Can we say that the time duration through which the object velocity was zero at point B is equal to zero seconds. ? And if not, how is this time calculated?

i would say it is zero for the same reason we say its velocity is zero. The reality is that the object's velocity approaches zero, but is zero just for a differential amount of time, just an instant...

the same way, we can say it stays exactly at point B just for a differential amount of time...

it's jut a matter of what we consider 0 velocity, 0 seconds, or exact B point...

 

[tanzil_dhk]

Re: Is it zero time

I would prefer halls answer...when returning to its origin...why does it matters the duration....in reaality its in own point...rather the duarion can be treated as infinitesly small just as its velocity tends to its highest point.