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It is approximately 36 million miles to Mars at closest approach, which happens only once every twenty-six months. For your question, you need not the distance to Mars, but the distance half way to Mars. That's the distance you need to accelerate before you begin your deceleration. You specified ten meters per second That is a reasonable approximation to the 9.8 meters per second squared we experience on Earth.The above question is also aimed at Catastrophe. Thank you for providing the maths involved, unfortunately the subject is not my best of subjects!