In physics, the speed drop is defined as the speed with which it is then the kinetic energy of an object, equal to the energy situation (gravitational). Also common definition of the speed drop as the speed required to escape the gravity field. Symbolizes the rapid drop symbol ve calculated the formula: where G is constant gravitation of the planet, M is the planet's mass, and r is the radius. draw from this law that the speed of escape of an object does not depend on mass, but only on the planet's mass. in the Earth's gravity field, it needs an object to leave Earth and anarchy of the speed ve drop is approximately equal to 11.2 km / s, but to escape the sun's gravity (and out of the solar system) from the same point, needs to drop speed 42.1 km / sec.