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A satellite is moved from a circular orbit with radius $2.5\,r_e$ ($r_e=6.37\times 10^6\,m$ is. the radius of the earth) to a new circular orbit with radius $3.5\,r_e$.

What is the ratio of the final kinetic energy of the satellite to the initial kinetic energy of the satellite?

$$\frac{KE_f}{KE_i}=?$$

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