If the final speed is not the exact speed required for a circular orbit, the satellite will travel in an ellipse around Earth; the time for one revolution, as well as the highest and lowest parts of the orbit, will be different from the expected values. This may, or may not, be relevant, depending on what the satellite is used for. For example, a satellite may be designed to pass over a certain part of Earth every 24 hours. If the orbit is wrong, the timing - as well as the part of Earth over which it moves - will be off.
Scientists must carefully set the right orbital speed for a satellite that will be orbiting Earth, so that it will orbit correctly. The wrong speed will have the satellite move too fast, or too slow, skewing information and possibly causing the satellite to fall out of orbit and back to the planet's surface.
The largest satellite orbiting the Earth is the Moon.
The only natural satellite orbiting Earth is the moon.
sending information back to Earth for processing and analysis by scientists on the ground.
Photos taken of Earth from an orbiting satellite
I saw a satellite orbiting around earth.
It is the moon.
By orbiting the earth about once a month.
A satellite is not always a robotic module constructed on Earth and launched into orbit. A satellite, in fact, is any object which is orbiting another. The orbiting object is the satellite of whatever it orbits. By now you ought to be able to guess it, but if not, it is the moon.
At periapsis, that is, when it is closest to Earth in its orbit.
sputnik
Sputnik-I