the diagram represent a .20 kg sphere moving to the right along a section of a frictionless surface. the speed of the sphere at point a is 3.0 meters per second. approximately how much kinetic energy does the sphere gain as it goes form point a to point b

Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel