Solve the all parts of given question:
Question: A dockworker applies a constant horizontal force of 79.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 12.0m in a time 4.90s.
Part I: What is the mass of the block of ice?
Part II: If the worker stops pushing at the end of 4.90s, how far does the block move in the next 4.80s?
Please show your all work and steps I am really confused.