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# Conservation of energy

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8. 40 A rocket is projected upward from the earth's surface (r=Re) WITH AN INITIAL SPEED Vo that carries it to a distance r=1.5Re from the center of the earth. What is the launch speed Vo? Assume that air friction can be ignored and give your answer in terms of g and Re.

Hint indicated: Potential energy is always neg. if the ref. level is zero at infinity.

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The potential energy of an object outside of earth is:

Where r is the ...

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The solution shows how to use conservation of energy to solve the problem.

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