Roberta Bondar is travelling in her space craft around a distant planet. The planet has a radius R' and she is at an altitude of 2R' above its surface, coasting at some constant speed in a circular orbit. She uses he rocket engines to change to a different circular orbit where she now coasts at a constant speed 50% greater than before. Calculate the altitude of this second orbit above the surface of the planet (in terms of R'). (Answer: R'/3)

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