Your robot will drive forward until it gets closer than 20 cm from a wall , then drive backwards until the robot is between 15 and 20 cm away from the wall, then stop the robot. The attached file can get you started with the robot moving back and forth forever.

Through the process of sedimentation,sediment is turned back to rock to form sedimentation.the process of sedimentation is: > deposition-where fragments were deposited into the river or sea under gravity or travelling agent such as wind or water. > sedimentation-the fragments deposited in the river sedimented and accumulate> compaction-the layers of fragments deposited undergoes compaction due to the weight if the upper layers> cementation-chemical substance of the fragments such as cement dissolved into the water and cement the other fragments together to form sedimentary rock.thus,cementation and compaction are the process.on the other hand, transformation only occur when a rock under goes metamorphism(compaction or extreme heat).while recrystillization occurs when a rock is melted and cooled down,which also requires metamorphism to take place.hope it !

This is an opinion based question, someone on the internet can’t answer it for you. it’s not like a math problem that has the same solution, this comes from your brain and what you think.