Design a vehicle powered by a falling brick that travels exactly 40 feet

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whozyourdaddy
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Design a vehicle that is powered only by a block of brick as the source of energy.

The vehicle must travel 40 feet and stop on the dime after 40 feet (in other words travel total of 40 feet of distance).

Design a pulley system involving a brick falling from a height (stored potential energy converted to kinetic energy) to move this vehicle.

All help is appreciated in advance,
Thanks
 
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