Hi, Im trying to make a design of a mechanical device that will propel a small cart along the ground for 5 metres, go up a sloped bank, stopand roll back down to rest. The design is not aloud to envolve any electrical or elastic components purely mechanical. I was just wondering if anyone had any ideas on how i may come up with a concept design. So far the only thing i can think of is to power a fly wheel to a certain rpm then attach it some how with gears to the axle of the cart. anyway I'm still thinking so suggestions would be appreciated. cheers.