Quote:
Originally Posted by leon
Now say I had a magic box that could 'turn down' the earth's gravity. I throw the ball as before. Then while it's in flight, I turn the earth's gravity down. That same ball with the same momentum sails high into the sky. If I turn it down again it *seems to accelerate until it leaves the gravitational pull of the earth altogether. *Seems to, only it's just the gravity of the earth that is being reduced.
There is you answer
Leon 
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It's an analogy to illustrate that a body in motion in a changing gravitational field would appear to be accelerating or decelerating. Surely you'll allow me that by way of illustrating the main point? I'm not saying such a magic box is required or actually exists.