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A rocket is fired vertically from the surface of mars with a pseed of 2 km `s^(-1)`. If 20% of its initital energy is lost-due to martian atmospheric resistance. How far will the rocket go vrom the surface of mars before returning to it? Mass of mars`=6.4xx10^(-23)` kg: radius of mars=`3395km,G=6.67xx10^(-11)kg^(-2)`.

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