A dockworker applies a constant horizontal force of 84.0N to a block of ice on a smooth horizontal floor.

A dockworker applies a constant horizontal force of 84.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 11.0M in a time 4.60S . What is the mass of the black? If the worker stops pushing at the end of 4.60 , how far does the block move in the next 6.00 ?