Solve the all parts of given question:
Question: Let's say that one of the skaters in the above video has a mass of 100 kg, and is skateboarding at 9.0m/s when he smacks into a guardrail and comes to a complete stop in 0.2 seconds.
Part I: Calculate the skater's deceleration.
Part II: Calculate the force of impact on the skater.
Please show all work and steps to find the force of impact on the skater.