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The problem is thus:

The acceleration of a satellite is given by -gR^2/r^2 where R= radius of earth and r = distance of satellite from center of the earth. Find escape velocity.

Now I have read the solution to this problem and in it the author at one point has integrated v dv = -gR^2/r^2 with the upper limit for vdv being 0 and the lower limit being Ve(Escape velocity).

Now my problem is, why is 0 the upper limit and Ve the lower limit if in magnitude Ve>0?

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# Homework Help: Escape nelocity derivation

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