Powering a Vehicle with Falling Mass: A Design Guide

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deuzada
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please help me to find out what is the best and simple way to convert the energy of falling mass to into forward motion? i have to design and creat a vehicle which uses a mass falling over a short distance to power a vehicle up an inclined ramp.
 
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A trebuchet (catapult) has been used to launch a Volkswagen. See this youtube (this is actually a parabola):
 
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You could drop a heavy weight on someone's head and then swipe his car keys...