because the earth is round like a ball!
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It will travel in a straight line as far as the x and z axises are concerned however in the Y axis the bodies path will be a inverted parabolic.
Because it does not have enough power to break through the atmosphere.
Simply put, the straight line is the on, and the circle is the off. These symbols represent an electrical circuit. The Straight line represents a closed circuit, which means the switch is on and the electric current can travel through it, and the circle means and open circuit, where the current cannot travel because the circuit is open. A quick trick to remember: "O, Open, Off".
Yes. If it is not straight, then it is not a line.
it just a straight line