A ball with a mass of 3.20 kg is moving with velocity  (6.80î − 2.40ĵ) m/s.  (HINT:  v2 = v · v.) (a) What is the ball's kinetic energy (in J) at this velocity?  J (b) Find the net work (in J) on the ball if its velocity changes to  (8.00î + 4.00ĵ) m/s.  J

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