A father racing his son has 1/3 the kinetic energy of the son, who has 1/3 the mass of the father. The father speeds up by 1.6 m/s and then has the same kinetic energy as the son. What are the original speeds of (a) the father and (b) the son? 4} (a) Number n Units 'D (b) Number l Units Aoating ice block is pushed through a displacement :1" = (24.0 m )i (130 m )j along a straight embankment by rushing water, which exerts a force 35 = [173 N )i (139 N )j on the block. How much work does the force do on the block during the displacement? Number a Units {D