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In theory, it is easy. Just use scholar physics. In scholar physics we do not calculate the friction in common models, cos it is difficult to determine exact amount of the friction (There are so many influneces like air pressure, the friction of surrounding obejcts), if we want to be strictly accurate, we should also calculate the gravity of other obecjts around our model object (also the gravity of Earth). So in cholar physics we ignore the friction and the only problem of prepetum moblie (prepetual motion mechine) is the exitence of frition (cos the friction causes all objects slowly or quickly deccelerate when no external energy is added to it, e.g. u need some external force to keep the car moving, the moment u stop supplying the car with this force, the car will deccelerate - make sense )
So, if we use the scholar physics we can solve the problem of prepetum mobile, cos there is no friction and in calculations the machine will move forever. Of course, there is one porblem: The scholar physics doesnt work in real world 
(For other questions contact ur teacher of physics :P )
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As officers gather evidence at the brutal crime scene, you can only ask yourselves: what kind of lunatic would commit such unthinkable crimes. The three adjectives which best describes this killer are sadistic, intelligent, and dangerous!!!
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