Why h is equal to 0m.
Why distance or h is 0m while measuring the distance of a body that is thrown from Earth's surface and then it comes to the same place from where it was thrown.
While doing maths from Galileo's Laws Of Falling Bodies, sometimes we see that when a body thrown from earth surface and after that it fall down on the same place from where it was thrown then we measure the distance or h as 0m. Now the question is why we measure the distance or h as 0m? For example tou throw a body from a point of earth surfece and you named it X and it goes up to a point 12 meter above from X and you named it Y. Now if I asked you the distance you can say that its 24. Cause first of all at the time of going up it arive 12 meter then at the time of fall down it again arive 12 meter, so the distance that it has passed is 12 meter + 12 meter = 24 meter.
Yeah you do 24 for meter if I want the displacement.Now the question is that aren't distance and displacement the same things?
The answer is "No", distance and displacement aren't same things. Let's know why distance and displacement aren't same things
Distance means difference of two point at a specific Direction where displacement means difference of two point at any direction.Let's see a picture to understand it easily.
Here thought that you are at the point A and want to go the point G. So as here shown first you will go 4m forward then after turning 90° left you will go 12m forward then you will turn 90° right and will go 10m forward then you will turn 90° left again and will go 6m forward and again turn 90° right and go 4m forward after that you will turn 90° left and will go 3m forward. Thuse you will go to your destination. So here the the way you have passed is (4m + 12m + 10m + 6m + 4m + 3m) = 49m. It's tour displacement but the distance you have passed is the length of the blue line of the picture which is 18m long. So distance is length of the way that you have passed at a specific angle but displacement is the total way that you have passed. That's why Distance and Displacement are not same.
Let's go back to the thrown body.So when a body is thrown from Earth's surface it goes up to the point. Here its direction is straight up and then it comes back to the same place from where it was thrown.So here it change its direction and we know that distance doesn't deppend on the change of ditrection. Distance is the difference of the point from where it was thrown and the point where it cames. As here the body cames to the same place from where it was thrown so here the difference is of the same point so it is surealy 0m. And as the difference is 0m then the distance is 0m. But if we cosider the displacement it will 24. Cause displacement is the difference of all the way it has passed and here at the time of going above it passed 12m and after changing its derection it again passed 12m at the time of fall down. So the displacement is 12m but distance is 0m.
That's why disatnce or h is 0m while measuring the distance of a body that is thrown from Earth's surface and then it cames to the same place from where it was thrown.
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