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What is the minimum energy required to l...

What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R?

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From the law of conservation of energy
`(-GMm)/R+KE_("imported")=(-GMm)/(2xx3R)`
`KE_("imported")=(GMm)/R(1-1/5)=5/6((GMm)/R)`
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