How can you use kinetic energy to complete a step in your contraption such as a rolling ball hitting a lever or switch

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

може ли да зареждате повече информация, моля

i think its 100.

hope this !