A rocket is fired ‘vertically' from the surface of Mars with a speed of 2 km s 1. If 20% of its initial energy is lost due to Martian atmospheric resistance, how far will the rocket go from the surface of Mars before returning to it ? Mass of Mars = 6-4 x 104 kg; radius of Mars = 3395 km ; G = 6.67 x 10-11 N m² kg-2.
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