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A rocket is fired ‘vertically’ from the ...

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 = `6.4xx10^23 kg`, radius of mars = 3395 km, G = `6.67xx10^-11 N m^2 kg^-2`.

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