Thanx Mindscrape,
however, da force i put in was the same. we used da one toy car and pressed it down till it cld not go down any further. how do i account for da different forces at different angles?
the toy car gains energy by pushin down the "head" of the "driver" and is powered by a spring that powers the wheels. at different heights, it has different spring constant. I mean the slope's angles are changed at different periods of the experiment. I am unable to work out the spring constant...