what is the difference between instaneous speed n instaneous velocity
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What is the difference between instantaneous velocity and intantaneous speed?
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Ganesh Subramaniam, Amateur Radio Operator, Amateur Astronomer
Answered Sep 4 2016 · Author has 2k answers and 2.9m answer views
Instantaneous speed is the speed of an object in motion at a particular instant in time; if we include the direction changes to that speed we get instantaneous velocity at that particular moment in time.
For example, if you are driving - returning home from office - a distance of ten kilometers - and you took 20 minutes to reach home, your average velocity would be 30 kmph. But during the journey you would have accelerated to 50 kmph when you started off, and slowed down to stop at a traffic light and again accelerated and so on, and maybe negotiated a left turn and went round an island and finally slowed down to negotiate a right turn to enter the gates of your home moving very slowly before stopping. So, during the journey you were accelerating and decelerating, changing directions, stopping at traffic signal, accelerating once again and so on, your speed changing every moment of the 20 minute journey that made your average velocity of 30 kmph. While driving if you had glanced at the speedometer and found it showing 30 kmph, then that is the instantaneous speed at that particular moment of time.
If you want to know the instantaneous velocity at a particular time during the journey - say, 3 minutes after you started off - you need to find a smaller displacement over a shorter time interval. Maybe exactly 00:03:00 in your journey your speed was 42 kmph - this is your instantaneous speed at that moment. If you were decelerating and negotiating a left turn at exactly 00:10:00 , the speed might have been 20 kmph, then the instantaneous velocity at that moment in time is 20 kmph LEFT.
Still have a question? Ask your own!
What is your question?
4 ANSWERS
Ganesh Subramaniam, Amateur Radio Operator, Amateur Astronomer
Answered Sep 4 2016 · Author has 2k answers and 2.9m answer views
Instantaneous speed is the speed of an object in motion at a particular instant in time; if we include the direction changes to that speed we get instantaneous velocity at that particular moment in time.
For example, if you are driving - returning home from office - a distance of ten kilometers - and you took 20 minutes to reach home, your average velocity would be 30 kmph. But during the journey you would have accelerated to 50 kmph when you started off, and slowed down to stop at a traffic light and again accelerated and so on, and maybe negotiated a left turn and went round an island and finally slowed down to negotiate a right turn to enter the gates of your home moving very slowly before stopping. So, during the journey you were accelerating and decelerating, changing directions, stopping at traffic signal, accelerating once again and so on, your speed changing every moment of the 20 minute journey that made your average velocity of 30 kmph. While driving if you had glanced at the speedometer and found it showing 30 kmph, then that is the instantaneous speed at that particular moment of time.
If you want to know the instantaneous velocity at a particular time during the journey - say, 3 minutes after you started off - you need to find a smaller displacement over a shorter time interval. Maybe exactly 00:03:00 in your journey your speed was 42 kmph - this is your instantaneous speed at that moment. If you were decelerating and negotiating a left turn at exactly 00:10:00 , the speed might have been 20 kmph, then the instantaneous velocity at that moment in time is 20 kmph LEFT.
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