Suppose that we discovered a large asteroid on a collision course with Earth. The collision is approximately 20 years in the future. What is the best option below to deal with this threat?

Acaterpillar tries to climb straight up a wall a meter high, but for every 2 cm up it climbs, it slides down 1 cm. eventually, it reaches the top. when it reaches the top, it does not pull itself over so it will slide down 1 cm. what is the total displacement traveled?