We can use these elements for good counductivty
i am not sure. i have to get back to you on that.
because of gravity.
because the slope is going down, the vehicle is going to be pulled down. when your going up the hill with a vehicle it's slower since the vehicle itself has to put it power to go up, and i don't really know why, and i'm not gonna search cause i have no time, it's basically just because of gravity.