when we walk on the earth with constant velocity
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I used to wonder this, but I think the answer is as follows.
When you achieve escape velocity, you are trying to achieve a speed that is fast enough to put you into an orbit around the earth. To be in orbit, the gavitational attraction of the earth is exactly balanced with the speed and height you are at, so that your path describes a circle (or ellipse) around the earth. I used to know the equations for circular motion but that was a long time ago.,
Conversely, if you just move upwards with a constant velocity, you will get to a great height, eventually into space, but if you stop your upward motion you will just fall straight back down again.
Hope this helps
When you achieve escape velocity, you are trying to achieve a speed that is fast enough to put you into an orbit around the earth. To be in orbit, the gavitational attraction of the earth is exactly balanced with the speed and height you are at, so that your path describes a circle (or ellipse) around the earth. I used to know the equations for circular motion but that was a long time ago.,
Conversely, if you just move upwards with a constant velocity, you will get to a great height, eventually into space, but if you stop your upward motion you will just fall straight back down again.
Hope this helps
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