Because any antenna on the ground that uses a satellite has to stay pointed at the satellite.
If the satellite is moving in the sky, then the antenna has to keep moving to follow it.
But if the satellite APPEARS to be motionless in the sky, then the antenna on the ground can be aimed once, and it doesn't have to be moved after that. "Set it and forget it."
There would be no TV satellites if everybody who wanted to use it had to keep moving their little dish to keep the TV picture coming in.
Hello!!
For calculate the velocity let's applicate the formula:
d = Distance = 4000 m
v = Velocity = ?
t = Time = 400 s
⇒ 
⇒ 
That is because work requires energy. According to the law of conservation of energy, it cannot be created or destroyed. When doing work, energy change forms and gets transferred to the object until it is released.
for example, when you lift up an object and place it on a higher elevation, you transferred energy to it and gave it potential energy. The potential energy is transformed into kinetic energy when the object falls down, and if it hits a surface, the energy will scatter, vibrating the areas around it and producing sound.
Also, work= force X distance. The energy does not go away, but rather get changed into some other form of energy
Answer:
I think the answer is 18 km/h
Explanation:
