escape velocity

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There is an attractive force beeen the object and earth. The initial kiic energy of the object has been all changed into potential energy at infinity. 2015-07-28 19:21:58 补充： The situation is just the same as throwing an object (e.g. a ball) vertically upward from earth surface. After the object leaves the thrower's hand
its velocity is continuously slowed down by the gravitational attractive force of the earth. 2015-07-28 19:25:22 补充： (cont'd)... As the object goes up
its kiic energy changes into (gravitational) potential energy. The velocity of the object bees zero when its initial kiic energy has all been changed into potential energy. Thus
the higher the initial velocity
the higher in height the object can reach. 2015-07-28 19:27:27 补充： (cont'd)... If the initial velocity of the object is high enough
it would reach infinity withou being stopped by gravity. 2015-07-28 19:30:02 补充： (cont'd)... An object can only move at uniform speed by inertia if there is no external force acting on it. But in the situation you described
there is an external force
gravity
that acts on the object during its motion.
温馨提示(增加知识): 其实无可能0 A: acceleration field del(A)=4(3.1415926535897932384626433...)GToo+lambda When Too(which is the energy density)--->0
dA=lambda( dx
dy
dz ) A=lambda ( r ) ------>Acceleration field is proportional to distance lambda=constant------->暗能量(Dark energy)