Can you allways use speed = distance /time relation

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SUMMARY

The relationship speed = distance/time can be used to find time only when velocity is constant. In cases where velocity varies, the motion must be divided into segments where velocity remains constant. For each segment, time can be calculated using the formula time = distance/speed. If the number of segments becomes excessive, calculus is required to accurately determine the total time.

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My question is when you know your velocity and the distance traveled...can you allways use speed =distance /time relation to find time..? Because it seems to only work on some occasion...i know this sounds like a stupid question but i just don't get it. Or does your velocity have to be conastant to be able to use this relationship?
 
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displacement = velocity * time... only when velocity is constant.
 
time=dist./speed

even if the velocity is not constant, you can find the time taken.

Do the following.
Break up the whole motion into parts. And those parts should be such that the velocity is constant in them. Now, for each part, calculate the time as

(distance traveled in that part) / (speed in that part, which is constant)

so you see, now you can add up all of the time intervals to get the whole time.

If the numebr of intervals becomes way too large, then you need to use calculus.

spacetime
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