# It is known from mechanics that a body thrown horizontally at a low speed near the Earth’s surface moves along a parabola.

September 19, 2020 | Education

| **It is known from mechanics that a body thrown horizontally at a low speed near the Earth’s surface moves along a parabola. Does it mean that this speed is equal to the second cosmic speed? Is there a contradiction here with Kepler’s first law?**

In problems in physics, the gravitational field near the Earth’s surface is assumed to be uniform, and in this case the body’s trajectory will indeed be a parabola. In the central field, which is the Earth’s gravitational field, a body thrown at a lower circular speed will move along an ellipse in accordance with Kepler’s first law. With a small throwing height (up to hundreds of meters), there will be no differences in both trajectories on the realizable section of the trajectory.

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